Remove twerking alias

Posted under Tags

BUR #14600 has been approved by @nonamethanks.

remove alias twerking -> ass_shake
remove alias twerk -> ass_shake

This alias makes sense if twerking is just another word for ass shaking, but it's not; twerking is a specific kind of ass shake (I'd hesitate to call it dancing). Compare post #4964946 to post #4642491. They're both ass_shake, sure, but only one of them is twerking.