working copy: rename working_copy_path() to just path()

It seems pretty clear from the context. Turns out we only use the
function in a test case. Maybe we don't even need it. It's easy to
provide it, though.

lib/src/local_working_copy.rs

@@ -1387,7 +1387,7 @@ impl WorkingCopy for LocalWorkingCopy {
         "local"
     }
 
-    fn working_copy_path(&self) -> &Path {
+    fn path(&self) -> &Path {
         &self.working_copy_path
     }
 

lib/src/working_copy.rs

@@ -30,7 +30,7 @@ pub trait WorkingCopy {
     fn name(&self) -> &str;
 
     /// The working copy's root directory.
-    fn working_copy_path(&self) -> &Path;
+    fn path(&self) -> &Path;
 
     /// The working copy's workspace ID.
     fn workspace_id(&self) -> &WorkspaceId;

lib/tests/test_local_working_copy_sparse.rs

@@ -88,7 +88,7 @@ fn test_sparse_checkout() {
     // Reload the state to check that it was persisted
     let mut wc = LocalWorkingCopy::load(
         repo.store().clone(),
-        wc.working_copy_path().to_path_buf(),
+        wc.path().to_path_buf(),
         wc.state_path().to_path_buf(),
     );
     assert_eq!(