[FIX] PluginMap: raise z-index of .ui-dialog so that popup dialog box doesn't show behind map when a location icon is clicked. Closes http://dev.tiki.org/item5020

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48942 b456876b-0849-0410-b77d-98878d47e9d5