[bp/r52499][FIX] trackers: Observe the Email field "link" parameter, specifically using the protect_email function when set to 1 (thanks marclaporte)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@52501 b456876b-0849-0410-b77d-98878d47e9d5