Fix wrong "player is not a moderator anymore" lobby chat message following initial implementation in rP19514/D339, fixes #4877.

It needs to test against the historic role and not the current role, similar to rP16997, refs #3386.
Implements the third GUI message property using the arbitrary lobby GUI message patch in rP22856/D2264, refs #4482, rP22855/D2265.

Differential Revision: https://code.wildfiregames.com/D2266
Tested on: clang 8.0.1