IDE: messages: if only one about, show in place

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45380 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: messages: filter urgency: changed to radioitems

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@45381 4005530d-fff6-0310-9dd1-cebe43e6787f