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/vim/src/normal/mark.rs

@@ -120,7 +120,6 @@ impl Vim {
                 });
             })
         });
-        return;
     }
 
     fn open_path_mark(

crates/vim/src/normal/search.rs

@@ -224,7 +224,7 @@ impl Vim {
                     .search
                     .prior_selections
                     .last()
-                    .map_or(true, |range| range.start != new_head);
+                    .is_none_or(|range| range.start != new_head);
 
                 if is_different_head {
                     count = count.saturating_sub(1)