[Normative]Fix has_top_right() for PARTITION_VERT_4
[Normative]Fix has_top_right() for PARTITION_VERT_4

See details in issue tracker.

BUG=aomedia:1827

Change-Id: If996f42647d7dbc29569179f46d14b5b4b082989

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom