[gnome-shell] messageTray: Clean up commented code a bit

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

commit 7df7cd01ebd95486f11d4947192bf55cffcc3766
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu Sep 20 19:31:24 2012 -0300

    messageTray: Clean up commented code a bit
    
    Since we changed the grabHelper.grab call to be in a conditional,
    it's been a little clear what the comment has been referring to.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=684458

 js/ui/messageTray.js |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/messageTray.js b/js/ui/messageTray.js
index 30cb6a7..6892ba1 100644
--- a/js/ui/messageTray.js
+++ b/js/ui/messageTray.js
@@ -2031,8 +2031,10 @@ const MessageTray = new Lang.Class({
         // Don't actually take a modal grab in the overview.
         // Just add something to the grab stack that we can
         // pop later.
+        let modal = !this._overviewVisible;
+
         if (!this._grabHelper.grab({ actor: this.actor,
-                                     modal: !this._overviewVisible,
+                                     modal: modal,
                                      onUngrab: Lang.bind(this, this._escapeTray) })) {
             this._traySummoned = false;
             return;