The in-game menu contains not only subtitles and volume settings,
but also load and save game options. Every time the menu was opened
it would write the subtitles and audio volumes to the ConfMan
resulting in toggling on overriding global options for this game, which
was a but strange when it was previously using global options and we
only wanted to load a game. So now the settings are written to ConfMan
from the in-game menu only when they are actually changed.
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