LCL:  TabControl forward style

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42560 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL:  TabControl fix borderwidth initialization 

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@42561 4005530d-fff6-0310-9dd1-cebe43e6787f