[Android] Refactor multiselect in video

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Thu Sep  6 15:12:31 2018 +0200| [32edb614cfa9eeee29ed932019834c0a08f1b640] | committer: Geoffrey Métais

Refactor multiselect in video

> https://code.videolan.org/videolan/vlc-android/commit/32edb614cfa9eeee29ed932019834c0a08f1b640
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 .../videolan/vlc/gui/video/VideoGridFragment.java  | 30 ++++--------
 .../videolan/vlc/gui/video/VideoListAdapter.java   | 55 +++++++---------------
 2 files changed, 26 insertions(+), 59 deletions(-)

Diff:   https://code.videolan.org/videolan/vlc-android/commit/32edb614cfa9eeee29ed932019834c0a08f1b640