Fix the Latenight skin quick effect toggle controls only affecting the first effect of the chain

[robbert-vdh]

I noticed that the quick effect chain bypass wasn't working correctly for effect chain presets with multiple effects (and setting the correct value from my controller didn't result in any visible feedback in the GUI). The other skins seem to already do the right thing here, so this was probably just an oversight.

[robbert-vdh]

The QuickEffect variable is also used for checking whether the chain is enabled. That's not the correct behavior for effect chains where the first slot is unused. I don't know if there's a better way to detect that the effect chain has finished loading, or if the knob should be hidden at all if it isn't.

[ronso0]

Thanks for the fix! That is obviously a leftover and I wonder why it wasn't discovered earlier...

Here's the commit that fixes the knob/button visibility conection c0acd2b
Note that after merging #10859 0 needs to be change to 1

or if the knob should be hidden at all if it isn't.

well, we may discuss that again. IIRC that's LateNight legacy behaviour and I appreciate it since it allows a clean UI in case you never use QuickEffects (like I do), it's simply one less thing to care about.

[robbert-vdh]

Oh awesome! I've already redone my effect chains so that the first effect is always used (I liked keeping the middle one as a filter so I can easily add something before or after it when saving a new preset), but it's nice to not have to do that ha.

[ronso0]

Great : )

Here's the commit that fixes the knob/button visibility conection c0acd2b

Feel free to pick that for this PR.

[robbert-vdh]

Done.

[ronso0]

Thanks.
I'll remove the leftover variables in a separate commit.