Simplify ref_mvs assignment
Simplify ref_mvs assignment

Drop unnecessary ref_mvs assignment steps in the rate-distortion
optimization process.

Change-Id: Icbd0436d2f962ec6b1141b889cf5892b863f081d

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