Modal: drop loop (#38368)

We only have two elements to iterate over so it doesn't make a lot of sense to use a loop here

js/src/modal.js

@@ -139,12 +139,12 @@ class Modal extends BaseComponent {
   }
 
   dispose() {
-    for (const htmlElement of [window, this._dialog]) {
+    EventHandler.off(window, EVENT_KEY)
-      EventHandler.off(htmlElement, EVENT_KEY)
+    EventHandler.off(this._dialog, EVENT_KEY)
-    }
 
     this._backdrop.dispose()
     this._focustrap.deactivate()
+
     super.dispose()
   }