Fix PlayQueueDemo.ino to behave correctly if testMode == 1 #459
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It is documented that if AudioPlayQueue::playBuffer() returns a non-zero value (fails), the call must be re-tried until the return value is zero (success). The demo did not do this, with the result that no sound was heard with testMode == 1
Issue was noted by Bob Larkin, who’s pulled the equivalent change into the AudioF32 library.