Use home page instead of queue page

Users that use the queue page a lot might end up with it as a start-up
page. However, this page is always empty and not useful at all, so load
Listen now page instead.

https://bugs.launchpad.net/nuvola-player/+bug/1306678

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>