winealsa.drv: Re-allow fallback to waveout (regression in dsound)

[Erich Hoover]

Real Name:
    Erich Hoover
Description:
    Commit 'f27d88e16fe0292d3efa7dac8966a0b612e62e6d' resulted in a
regression in the support of dsound, causing C&C3 and C&C3: Kane's
Wrath to crash on load (Bug #19369).  This patch reverts the fallback
to waveout that was removed by the commit (code unrelated to the rest
of the patch).
Changelog:
    winealsa.drv: Re-allow fallback to waveout (regression in dsound)