IDE: install pkg dialog: fixed not listing install packages in available list

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42764 4005530d-fff6-0310-9dd1-cebe43e6787f
IDE: less hints

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42765 4005530d-fff6-0310-9dd1-cebe43e6787f