[FIX] validation: Now that tracker fields get validated server-side as well as client-side (following r52254) patterns that previously worked (where backslashes and quotes had to be escaped) now need special handling for the server-side validation (i.e. unquoting). Not a backport as in 13.x onwards patterns will have to be changed to what they should have been in the first place.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@52345 b456876b-0849-0410-b77d-98878d47e9d5