[CLK] Implement/fix display refresh without affecting the timing

[carlosedp]

Whenever I toggle displayRefresh on HandleOutputs or ClockPulse functions, the display updates but timing gets affected.

https://github.com/carlosedp/Eurorack-Modules/blob/c834a2b5d8780e19459fd05342da30ce27328a3f/firmware-CLK/src/main.cpp#L720-L729