belted_* -> belt

BUR #50868 is pending approval.

create implication belted_skirt -> belt
create implication belted_skirt -> skirt
create implication belted_shorts -> belt
create implication belted_shorts -> shorts

belted clothes

Belt+skirt has 112k posts and belt+shorts has 69k posts. Neither of them appear to have that many false positives. These tags are useless unless we want to populate them on tens of thousands of posts.