workspace: change save prompt for unnamed buffers (#3037)

Release Notes:
- N/A

crates/workspace/src/pane.rs

@@ -2213,7 +2213,7 @@ fn dirty_message_for(buffer_path: Option<ProjectPath>) -> String {
     let path = buffer_path
         .as_ref()
         .and_then(|p| p.path.to_str())
-        .unwrap_or(&"Untitled buffer");
+        .unwrap_or(&"This buffer");
     let path = truncate_and_remove_front(path, 80);
     format!("{path} contains unsaved edits. Do you want to save it?")
 }