Set ref frame scaling factor in RTC inter mode decision

Properly set the corresponding scaling factor of the reference
frame in the non-RD mode decision process. This allows the mode
search process to account for the scaled reference frame when
selecting coding mode.

Change-Id: I9d41bff6931c98e5a82b413e37ac5e6e14b93b23
Merge "Set ref frame scaling factor in RTC inter mode decision"