Restore ref_frame index for interintra
Restore ref_frame index for interintra

Restore mbmi->ref_frame[1], which has been modified in
motion_mode_rd by interintra.

Change-Id: I8b3e0e4f12a5eb80db75e5e8c2fe72daf5ef65f3

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