Bug 1025149 - Hack to prevent the homescreen from navigating away from i...

...tself
@alivedise Digging into the code more it is triggered here https://github.com/lightsofapollo/gaia/blob/bug-1025149-hack/apps/system/js/app_window.js#L885-L888 by this https://github.com/lightsofapollo/gaia/blob/bug-1025149-hack/apps/system/js/app_window.js#L644