Fixing measure highlight for measures greater than 8
Fixing measure highlight for measures greater than 8

Previously, when the playback head was in a measure past the 8th
measure, the measure column highlight would wrap around back to
the 1st measure. This is because the measure count in the "which
measure to highlight" logic was hard-coded to 8, instead of using
the actual measure count.

jstrait/jssynth,jstrait/jssynth