When Android sends Dolphin to the background, emulation *must* pause,
otherwise emulation continues running and continues outputting audio to
the user. RetroAchievements mustn't be allowed to override it.

Android: Show input indicators in controller settings

Without this, there was a bug where if you turned the device's screen
off and on again while in the advanced mapping dialog, the input
indicators would stop updating. This is because turning the screen on
again causes devices to refresh, which causes all devices to be
recreated, leaving the AdvancedMappingControlViewHolders stuck
referencing controls belonging to devices that are no longer being
updated.

This makes sure view holders get proper widths when they use
layout_width="match_parent". This becomes quite noticeable for
AdvancedMappingControlAdapter in the next commit, but I'm also
making the change for other adapters while I'm at it.