bugfix dashboard_showfullsize only in DashboardRoom.
       Fix showhelper Bug on lock/unlock. The error that after a trigger 
       action the curren tab is changed to the "old" activetab tab has been fixed.
feature Tabs can show an icon.

git-svn-id: svn://svn.code.sf.net/p/fhem/code@4809 2b470e98-0d58-463d-a4d8-8e2adae1ed80