[FIX] comments: Restore missing comment options in admin/wiki - lost several Tikis ago (thanks Geoff)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48529 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Changes added to fix Wiki preview is blank on htmldiff and sidebysidediff. Ref: http://dev.tiki.org/item4856

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48531 b456876b-0849-0410-b77d-98878d47e9d5