Keybindings: reverse key combination read from settings

Window menus use the first key combination for a binding to show the
acceleration, so the list must be in the right configured order, which
is the opposite of what's built by g_slist_prepend()

https://bugzilla.gnome.org/show_bug.cgi?id=694045

src/core/prefs.c

@@ -1815,6 +1815,8 @@ update_binding (MetaKeyPref *binding,
                       binding->name, keysym, keycode, mods);
     }
 
+  binding->bindings = g_slist_reverse (binding->bindings);
+
   return changed;
 }