JVET-N0288 proposal 1: infer num_tiles_per_tile_group to 1, if rect_tile_group_flag is 1 and the single_tile_per_group_flag is 0
Implemention of JVET_N0288 proposal 1, infer the num_tiles_per_tile_group to be 1 if rect_tile_group_flag is 1 and the single_tile_per_group_flag is 0.
Edited by Karsten Suehring