Remove a limit check in layout calculation
Remove a limit check in layout calculation

The limit of 32768 was causing a bad side effect of limiting the number of entries in TGListBox to 2048, since:
   number of entries(2048) * entry height(16) > 32768
as reported on the forum (http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=18555)

tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot,tc3t/qoot