[win32] Actual Volume Sliders behavior on LOW-quality settings

[eugene-s-nesdev]

Taken from here: https://github.com/TASVideos/fceux/issues/332 [win32] version disables square2 (real is square1), triangle and PCM volume sliders when using low-quality settings as shown here: https://imgur.com/a/Fas3vOd

But when i tested QT-version, real FCEUx core logic have another lq-settings behavior:

Triangle slider - controls Noise channel. Square1 slider - controls Square 2 channel. Square2 slider - controls Square 1 channel. Noise slider - does nothing. PCM slider - does nothing.

Testing HERE, look and listen attentively please: https://youtu.be/7xBr5jcKfZE

So, only triangle and PCM cannot be changed in low-quality mode. BTW, win32 "square" slider controls square 2 channel in low-quality mode: