LCL: fix TabControl spacing 

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42558 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL: fix TabControl invalidation

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42559 4005530d-fff6-0310-9dd1-cebe43e6787f