Fix invisible chat icons (#10406)

As of #10393 some icons in the chat were invisible, looking at the icons
I noticed that the viewport was actually 800x800, I scaled that down to
16x16 and now they work fine again.

Also remove the `reply_arrow_left` icon because it is not used at all.

Thanks to @RemcoSmitsDev for noticing.

I don't have any expertise in svg's, so if something is off about the
svg markup reach out to me.

Release Notes:

- N/A

assets/icons/pencil.svg

@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="utf-8"?><!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
-<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path d="M18 10L21 7L17 3L14 6M18 10L8 20H4V16L14 6M18 10L14 6" stroke="#000000" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"/>
-</svg>
+<svg width="16" height="16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="m12 6.668 2-2L11.332 2l-2 2M12 6.668l-6.668 6.664H2.668v-2.664L9.332 4M12 6.668 9.332 4" stroke="black" stroke-width="1" stroke-linejoin="round"/>
+</svg>

assets/icons/reply_arrow_left.svg

@@ -1,4 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?><!-- Uploaded to: SVG Repo, www.svgrepo.com, Generator: SVG Repo Mixer Tools -->
-<svg width="800px" height="800px" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path d="M20 17V15.8C20 14.1198 20 13.2798 19.673 12.638C19.3854 12.0735 18.9265 11.6146 18.362 11.327C17.7202 11 16.8802 11 15.2 11H4M4 11L8 7M4 11L8 15" stroke="#000000" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"/>
-</svg>

assets/icons/reply_arrow_right.svg

@@ -1,56 +1,3 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!-- Uploaded to: SVG Repo, www.svgrepo.com, Transformed by: SVG Repo Mixer Tools -->
-
-<svg
-   width="800px"
-   height="800px"
-   viewBox="0 0 24 24"
-   fill="none"
-   version="1.1"
-   id="svg1"
-   sodipodi:docname="reply-svgrepo-com.svg"
-   inkscape:version="1.3.2 (091e20e, 2023-11-25)"
-   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
-   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
-   xmlns="http://www.w3.org/2000/svg"
-   xmlns:svg="http://www.w3.org/2000/svg">
-  <defs
-     id="defs1" />
-  <sodipodi:namedview
-     id="namedview1"
-     pagecolor="#505050"
-     bordercolor="#ffffff"
-     borderopacity="1"
-     inkscape:showpageshadow="0"
-     inkscape:pageopacity="0"
-     inkscape:pagecheckerboard="1"
-     inkscape:deskcolor="#505050"
-     showgrid="false"
-     inkscape:zoom="0.39996789"
-     inkscape:cx="435.03492"
-     inkscape:cy="417.53351"
-     inkscape:window-width="1440"
-     inkscape:window-height="847"
-     inkscape:window-x="0"
-     inkscape:window-y="25"
-     inkscape:window-maximized="1"
-     inkscape:current-layer="svg1" />
-  <g
-     id="SVGRepo_bgCarrier"
-     stroke-width="0" />
-  <g
-     id="SVGRepo_tracerCarrier"
-     stroke-linecap="round"
-     stroke-linejoin="round" />
-  <g
-     id="SVGRepo_iconCarrier"
-     transform="matrix(-1,0,0,1,24.001548,0)">
-    <path
-       d="M 20,17 V 15.8 C 20,14.1198 20,13.2798 19.673,12.638 19.3854,12.0735 18.9265,11.6146 18.362,11.327 17.7202,11 16.8802,11 15.2,11 H 4 m 0,0 4,-4 m -4,4 4,4"
-       stroke="#000000"
-       stroke-width="2"
-       stroke-linecap="round"
-       stroke-linejoin="round"
-       id="path1" />
-  </g>
+<svg width="16" height="16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M2.668 11.332v-.797c0-1.12 0-1.683.219-2.11.191-.374.496-.683.87-.874.43-.219.99-.219 2.11-.219h7.469m0 0-2.668-2.664m2.668 2.664L10.668 10" stroke="black" stroke-width="1.33334" stroke-linecap="round"/>
 </svg>

crates/ui/src/components/icon.rs

@@ -103,7 +103,6 @@ pub enum IconName {
     ReplaceNext,
     Return,
     ReplyArrowRight,
-    ReplyArrowLeft,
     Settings,
     Screen,
     SelectAll,
@@ -200,7 +199,6 @@ impl IconName {
             IconName::ReplaceNext => "icons/replace_next.svg",
             IconName::Return => "icons/return.svg",
             IconName::ReplyArrowRight => "icons/reply_arrow_right.svg",
-            IconName::ReplyArrowLeft => "icons/reply_arrow_left.svg",
             IconName::Settings => "icons/file_icons/settings.svg",
             IconName::Screen => "icons/desktop.svg",
             IconName::SelectAll => "icons/select_all.svg",