Victory music fails to play

[brian]

Victory music is failing to play when the victory popup is displayed. It continues playing the regular ambient or battle music instead.

[Edit] Did not see ticket #2714, so this is roughly a duplicate.

[Itms]

In 15689:

Stop updating some data after the end of a game.
This prevents game music from being played again, just after defeat/victory.

Fixes #2714, #2744