Tag alias: mistress -> dominatrix

Tag cleanup.

create alias mistress -> dominatrix

Link to alias

Link to wiki: mistress -> dominatrix

Isn't mistress a bit too ambiguous to be aliased?
It has a wiki directing to currently used tags and forum #42921 shows that it was in use at some point, so its content must have been moved to a less ambiguous dominatrix tag.

Agreed, mistress can mean a lot of things outside of S&M contexts.