v179
Base: v178.

Single targeted change:
- removed direct felt_latch -> Sustain screenLine5 update
- AUX still updates the stored Sustain state
- screenLine5 is emitted only by the Parameters-page refresh path from v178

Result intended:
- AUX on Stars cannot make Sustain Off/On appear there
- returning to Parameters shows the current Sustain state
- audio/AUX LED/Stars renderer untouched
