Navigation from playback screens

[Vicpa]

using a mouse/keyboard having the back button in the 'app bar" I think that is what it is call is a pain. You have to pull or push to have that exposed etc. Would be much better if in page header.

[Fredrik Zetterlund]

Fixed by https://bitbucket.org/7illusions/emby-winrt/commits/c0759e6bf6daaace7fc48d50980a9567c98324c9