Don't quantize continuous parameters assigned to the data (ie: speed) pot

Before this fix, the smallest adjustment you could make to the arpegiator speed, mod delay, vibrato speed, etc was in large increments of "5".

Continuous parameters assigned to the data pot were not adjustable in increments smaller than CHANGE_DETECT_THRESHOLD.  The LCD did change, but it was misleading, and the underlying values in currentPreset.continuousParameters[...] were not being set.