LCL: TUpDown: override directly instead of indirect via events

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46772 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL: TUpDown: use type

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46773 4005530d-fff6-0310-9dd1-cebe43e6787f