Validate output mode, correct dry/wet handling.

Seems like any non-zero parameter sets it, actually.  I previously changed
it to check the lowest bit but I can't reproduce it now...
Fix sceSas outputMode = 1 (which is not mono.)

May fix games that played audio only on the left side, or something.
Report the raw output mode to find examples.

I can't find any games actually leaving the output mode at 1.
Don't report sceSasSetADSRMode(..., 5, 5, 5, 5).

It seems common.
sceSasCoreWithMix() returns an error in raw mode.

And does not reschedule, specifically.
Merge pull request #5542 from unknownbrackets/sas-minor

Yet more exactness changes for SAS