IDEIntf: object inspector: component tree: list tkClass property only once

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42951 4005530d-fff6-0310-9dd1-cebe43e6787f
IDEIntf: clean up

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42952 4005530d-fff6-0310-9dd1-cebe43e6787f