Upcoming moOde 6.4.1 Update

[TheOldPresbyope]

Hey I'd like to tackle a minor gripe with the library in radio mode for next release 6.4.2 and as a small pull request. Start small

A user had noted the same gripe that there's no back button, so browsing folders in radio gets annoying fast, having to return home and navigate back down. In the interest of good organization folders are more helpful than one level of stations.

See a problem; fix a problem.

Regards,
Kent