[gnome-weather] Fix critical warning at startup

[Giovanni Campagna <gcampagna src gnome org>]

commit 8af140f2ee90d719d2b0027225f624a574d3aaac
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Sun May 8 20:15:28 2016 -0700

    Fix critical warning at startup

 src/app/main.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/app/main.js b/src/app/main.js
index 5c0b4f0..3f57083 100644
--- a/src/app/main.js
+++ b/src/app/main.js
@@ -150,7 +150,7 @@ const Application = new Lang.Class({
 
         this._initAppMenu();
 
-        this.add_accelerator("Escape", "win.selection-mode(false)", null);
+        this.add_accelerator("Escape", "win.selection-mode", new GLib.Variant('b', false));
         this.add_accelerator("<Primary>a", "win.select-all", null);
     },