workspace: Remove tweens of overlay.title before animate again

Currently we are removing tweens of the button and border, but not from
the title. That causes the title to be in wrong positions sometimes when
dragging windows on the overview, given that the slider is moving and
therefore the windows + overlay are moving too.
To avoid that, remove tweens of the title as well.

js/ui/workspace.js

@@ -519,6 +519,7 @@ const WindowOverlay = new Lang.Class({
 
         Tweener.removeTweens(button);
         Tweener.removeTweens(border);
+        Tweener.removeTweens(title);
 
         let [cloneX, cloneY, cloneWidth, cloneHeight] = this._windowClone.slot;