[FIX] CSS: Improvement on previous commit, ugly scrollbars are only needed in panel-collapse (accordion) panels, "overflow: visible" works just fine on normal ones like modules

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52914 b456876b-0849-0410-b77d-98878d47e9d5