Fix a bunch of other low-hanging style lints (#36498)

- **Fix a bunch of low hanging style lints like unnecessary-return**
- **Fix single worktree violation**
- **And the rest**

Release Notes:

- N/A

crates/rules_library/src/rules_library.rs

@@ -703,9 +703,7 @@ impl RulesLibrary {
                     .delegate
                     .matches
                     .get(picker.delegate.selected_index())
-                    .map_or(true, |old_selected_prompt| {
-                        old_selected_prompt.id != prompt_id
-                    })
+                    .is_none_or(|old_selected_prompt| old_selected_prompt.id != prompt_id)
                     && let Some(ix) = picker
                         .delegate
                         .matches