msacm32/tests: msacm32 can enumerate drivers that cannot be loaded or have their details queried. Deal with this properly.

msacm32: In acmDriverDetails if we are unable to load the driver then return MMSYSERR_NOTSUPPORTED as windows does.

msacm32: If a driver load fails and it does not give us another error set the error to MMSYSERR_NODRIVER.