chore: Fix several style lints (#17488)

It's not comprehensive enough to start linting on `style` group, but
hey, it's a start.

Release Notes:

- N/A

crates/collab/src/tests/following_tests.rs

@@ -506,7 +506,7 @@ async fn test_basic_following(
 
     // Client B activates an item that doesn't implement following,
     // so the previously-opened screen-sharing item gets activated.
-    let unfollowable_item = cx_b.new_view(|cx| TestItem::new(cx));
+    let unfollowable_item = cx_b.new_view(TestItem::new);
     workspace_b.update(cx_b, |workspace, cx| {
         workspace.active_pane().update(cx, |pane, cx| {
             pane.add_item(Box::new(unfollowable_item), true, true, None, cx)