[gnome-shell] dnd: Declare restore location variables

[Marco Trevisan <marcotrevi src gnome org>]

commit 69da686fa9dc5dbe8c1dae1b8775108d7117f506
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Wed Dec 6 19:03:51 2017 -0500

    dnd: Declare restore location variables
    
    https://bugzilla.gnome.org/show_bug.cgi?id=791233

 js/ui/dnd.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/dnd.js b/js/ui/dnd.js
index a64915b..33580ee 100644
--- a/js/ui/dnd.js
+++ b/js/ui/dnd.js
@@ -583,7 +583,7 @@ var _Draggable = new Lang.Class({
 
     _restoreDragActor: function(eventTime) {
         this._dragInProgress = false;
-        [restoreX, restoreY, restoreScale] = this._getRestoreLocation();
+        let [restoreX, restoreY, restoreScale] = this._getRestoreLocation();
 
         // fade the actor back in at its original location
         this._dragActor.set_position(restoreX, restoreY);