cleanup: Use type-safe comparisons

We have been using type-safe comparisons in new code for quite a while
now, however old code has only been adapted slowly.

Change all the remaining bits to get rid of another legacy style
difference.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2866>

js/ui/userWidget.js

@@ -170,7 +170,7 @@ class UserWidget extends St.BoxLayout {
         // If user is null, that implies a username-based login authorization.
         this._user = user;
 
-        let vertical = orientation == Clutter.Orientation.VERTICAL;
+        let vertical = orientation === Clutter.Orientation.VERTICAL;
         let xAlign = vertical ? Clutter.ActorAlign.CENTER : Clutter.ActorAlign.START;
         let styleClass = vertical ? 'user-widget vertical' : 'user-widget horizontal';