Fix wrong audio samplerate when using framerates other than 60FPS.

[vanfanel]

The engine seems to generate 44100 samples per second, which sounds good at 60FPS, but sounds at the wrong speed when settings other framerates in the the game options.
So this simply compensates the number of samples generated so it sounds good with other framerates.

[anzz1]

This sounds like a frontend / audio backend issue rather than a core issue. Audio sample rate should definitely not be related to video frame rate like that. On my frontend the audio works correctly at whatever framerate, i.e. changing the frame rate does not affect the pitch / speed / rate, nor should it.

Would not merge this, as further investigation to the real cause is warranted. I would start investigating the frontend / audio backend, not change the sample rate to an arbitrary value.