[FIX] forums: Add a special case replace for some links in html emails which were ending up with ===wiki markup=== showing

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52990 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/13.x 52988 to 52990

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52992 b456876b-0849-0410-b77d-98878d47e9d5