Revert "[2/3] audio_effects: Add a stereo widening effect"

This reverts commit 65678b97770fd91e9574034217e3cfa922461c0f.
Revert "[1/3] AudioEffects: Add center frequency param to bassboost"

This reverts commit 40ddd680e88dd3fa064745683d8b05d8dbdf2826.