workspacesView: Don't make reactive

Since commit a11f417cd0, scroll events are handled by the SwipeTracker.
There's no other reason for the view to be reactive, so don't make it so.

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1333

js/ui/workspacesView.js

@@ -21,7 +21,7 @@ var WorkspacesViewBase = GObject.registerClass({
     GTypeFlags: GObject.TypeFlags.ABSTRACT,
 }, class WorkspacesViewBase extends St.Widget {
     _init(monitorIndex) {
-        super._init({ style_class: 'workspaces-view', reactive: true });
+        super._init({ style_class: 'workspaces-view' });
         this.connect('destroy', this._onDestroy.bind(this));
         global.focus_manager.add_group(this);