Fix: BIF pads on Tu right/bottom of VB
Padding is necessary if the VB meets the right/bottom side of Tu. However, the current implementation pads on every right/bottom side of Tu if it is located right/bottom to VB.
No impact on CTC. No leak when GDR is enabled.
BDrate changes on ECM 5.1, when GDR is enabled.
Class C -0.05% 0.19% 0.10%
Class D -0.02% -0.18% -0.01%
Class E -0.01% 0.01% 0.13%
Class F -0.11% 0.03% -0.24%
Edited by Seungwook Hong