[gnome-shell] Add a missing "let".

[Siegfried-Angel Gevatter Pujals <sgevatter src gnome org>]

commit 79d5d3dba0e9b75c7877acd67e1b8928c3f526a0
Author: Siegfried-Angel Gevatter Pujals <rainct ubuntu com>
Date:   Sat Sep 26 00:48:34 2009 +0200

    Add a missing "let".

 js/ui/workspaces.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/workspaces.js b/js/ui/workspaces.js
index 41042d7..def2fd1 100644
--- a/js/ui/workspaces.js
+++ b/js/ui/workspaces.js
@@ -211,7 +211,7 @@ WindowClone.prototype = {
         this._zoomLocalOrig  = new ScaledPoint(this.actor.x, this.actor.y, this.actor.scale_x, this.actor.scale_y);
         this._zoomGlobalOrig = new ScaledPoint();
         let parent = this._origParent = this.actor.get_parent();
-        [width, height] = this.actor.get_transformed_size();
+        let [width, height] = this.actor.get_transformed_size();
         this._zoomGlobalOrig.setPosition.apply(this._zoomGlobalOrig, this.actor.get_transformed_position());
         this._zoomGlobalOrig.setScale(width / this.actor.width, height / this.actor.height);