When removing project slugs, try to remove raw slugs too so we can remove old/invalid slugs
Ref T10168. When we try to remove an additional hashtag, we remove the normalized version.
Instead, remove both the literal and normalized versions. This allows us to remove old/invalid slugs.
Test Plan: Removed garbage slugs like [,*,].
Reviewed By: chad
Maniphest Tasks: T10168
Differential Revision: https://secure.phabricator.com/D15048