[FIX]Set a minimum width for Jquery Chosen labels, so that they are seen by the user even in cases of dynamic items list, where the second dropdown was not being expanded and options where not displayed. This closes http://dev.tiki.org/item4942

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48949 b456876b-0849-0410-b77d-98878d47e9d5