Remove the close icon from playback notif

Merged Geoffrey Métais requested to merge Dekans/vlc-android:notification_close into master

The "close" action cannot work once VLC is already killed.

So this button is not relevant, and even misleading for most user.

The standard behavior on Android (cf Play Music & Spotify) is to not offer additional action for notification removal. Swipe is the standard way to clear the notifications.

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