Fix a bug of default_motion_mode_prob array size mismatch
Fix a bug of default_motion_mode_prob array size mismatch

Change-Id: Ib245b059f1c1aa450b0755b437eab15c362d3aee

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