Remove Worktree::abs_path

I'd like to only have methods related to absolute paths on local worktrees, because it's not really possible to implement them on remote worktrees since we don't know the full path being shared and wouldn't have anything to do with it anyway if we did.

crates/editor/src/items.rs

@@ -122,13 +122,9 @@ impl ItemView for Editor {
     }
 
     fn title(&self, cx: &AppContext) -> String {
-        let filename = self
-            .buffer()
-            .read(cx)
-            .file(cx)
-            .and_then(|file| file.file_name(cx));
-        if let Some(name) = filename {
-            name.to_string_lossy().into()
+        let file = self.buffer().read(cx).file(cx);
+        if let Some(file) = file {
+            file.file_name(cx).to_string_lossy().into()
         } else {
             "untitled".into()
         }