[gnome-shell] workspaceThumbnail: Remove unused properties

[Marge Bot <marge-bot src gnome org>]

commit 69717424f72d547d281ef7f952a3f7d99d6813ca
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Mar 4 23:55:57 2022 +0100

    workspaceThumbnail: Remove unused properties
    
    Those aren't used anymore since the switch to connectObject().
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2222>

 js/ui/workspaceThumbnail.js | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/js/ui/workspaceThumbnail.js b/js/ui/workspaceThumbnail.js
index 85456fb474..cb8a191882 100644
--- a/js/ui/workspaceThumbnail.js
+++ b/js/ui/workspaceThumbnail.js
@@ -674,10 +674,6 @@ var ThumbnailsBox = GObject.registerClass({
         });
         this.connect('destroy', () => this._onDestroy());
 
-        this._nWorkspacesNotifyId = 0;
-        this._activeWorkspaceChangedId = 0;
-        this._syncStackingId = 0;
-
         this._scrollAdjustment = scrollAdjustment;
         this._scrollAdjustment.connectObject('notify::value',
             () => this._updateIndicator(), this);