dmusic/tests: Add some IDirectMusic_SetDirectSound() tests.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=30792

Your paranoid android.


=== wvistau64 (32 bit dmusic) ===
dmusic.c:143: Test failed: DirectSoundCreate failed: 88780078
00c4:dmusic: unhandled exception c0000005 at 73C598FB