SCI: Revert "Fix bug #3605269 - "SCI: KQ5 Windows CD - Game Hangs Before Final Battle""

This reverts commit 2e93ee2b8301cf48e86c799c429f5e09fd09f051.
This bug is unrelated to MIDI signals.

Conflicts:
	engines/sci/sound/soundcmd.cpp
SCI: WIP: Add global 400 as a Windows flag.

This properly fixes bug #3605269 where the game hangs waiting for audio cues.