[gnome-shell] grabHelper: Fix up event handling for ignoring releases

[Jasper St. Pierre <jstpierre src gnome org>]

commit 8dc63932fc149b0177da8a655513e5f72cc5e292
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Dec 4 15:11:06 2012 -0500

    grabHelper: Fix up event handling for ignoring releases
    
    We need to return 'true' to signify that we handled the event.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=689109

 js/ui/grabHelper.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/grabHelper.js b/js/ui/grabHelper.js
index b9e661f..27e1e58 100644
--- a/js/ui/grabHelper.js
+++ b/js/ui/grabHelper.js
@@ -310,7 +310,7 @@ const GrabHelper = new Lang.Class({
 
         if (release && this._ignoreRelease) {
             this._ignoreRelease = false;
-            return false;
+            return true;
         }
 
         if (!button && this._modalCount == 0)