Remove some redundant entity clones (#36274)

`cx.entity()` already returns an owned entity, so there is no need for
these clones.

Release Notes:

- N/A

crates/git_ui/src/git_panel.rs

@@ -3410,7 +3410,7 @@ impl GitPanel {
             * MAX_PANEL_EDITOR_LINES
             + gap;
 
-        let git_panel = cx.entity().clone();
+        let git_panel = cx.entity();
         let display_name = SharedString::from(Arc::from(
             active_repository
                 .read(cx)