Fix for Ticket #424: uncompliant sps_log2_diff_max_bt_min_qt_inter_slice
MaxBTSize was not taking the current CTU size into account and thus kept the default values (like 128 whereas the CTU may be 64).
MaxBTSize was not taking the current CTU size into account and thus kept the default values (like 128 whereas the CTU may be 64).