[bp/r48312][FIX]If user selects all months (max="-1"), show  at least 10 years instead of just 1. Cheap usability fix to close http://dev.tiki.org/item4794

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/9.x@48314 b456876b-0849-0410-b77d-98878d47e9d5