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

This reverts commit 340848e9a29995a57775f6e50b32d2b2553df760.
Revert "[1/3] AudioEffects: Add center frequency param to bassboost"

This reverts commit 54e19605739a866f898a0ef17a2a5297118dd3f1.