Minor code change to make step sequencer handle partial octaves

Development Audio
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1

I was digging through the Step Sequencer code and noticed that if you changed one line of code I think it could (kinda) handle quarter / half / third octave transposition.

Current:
const int32 AdditionalOctaveNotes = (int32)*AdditionalOctavesInPin * 12;

Modified:
const int32 AdditionalOctaveNotes = (int32)(*AdditionalOctavesInPin * 12.0f);

(Line 590 of StepSequencePlayerNode.cpp in the Harmonix source directory)