dateMenu: Re-add special-casing of evolution-calendar

When commit 724a2bd7 changed the way to determine the default
calendar app, it dropped all special handling of evolution.
Unfortunately we still need it to not end up with the default
mail component, so add it back.

https://bugzilla.gnome.org/show_bug.cgi?id=696432

js/ui/dateMenu.js

@@ -221,6 +221,8 @@ const DateMenuButton = new Lang.Class({
         this.menu.close();
 
         let app = Gio.AppInfo.get_default_for_type('text/calendar', false);
+        if (app.get_id() == 'evolution')
+            app = Gio.DesktopAppInfo.new('evolution-calendar');
         app.launch([], global.create_app_launch_context());
     },