[Android] Fix Audio list background on tablets + small refactor

[Nicolas Pomepuy]

vlc-android | branch: master | Nicolas Pomepuy <nicolas at videolabs.io> | Thu Apr 23 12:10:07 2020 +0200| [3aa560d7e80a8b19b132e70b7ba8ba5bd6ae73af] | committer: Geoffrey Métais

Fix Audio list background on tablets + small refactor

> https://code.videolan.org/videolan/vlc-android/commit/3aa560d7e80a8b19b132e70b7ba8ba5bd6ae73af
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 .../vlc/gui/audio/AudioAlbumsSongsFragment.kt      | 25 ++-----------
 .../videolan/vlc/gui/audio/AudioBrowserFragment.kt | 25 ++-----------
 .../org/videolan/vlc/gui/audio/BaseAudioBrowser.kt | 42 +++++++++++++++++++++-
 3 files changed, 45 insertions(+), 47 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/3aa560d7e80a8b19b132e70b7ba8ba5bd6ae73af