Unify the use of inter predictor in encoder and decoder
Unify the use of inter predictor in encoder and decoder

This commit unifies the inter predictor used in the encoder and
decoder side for super-tx experiment. This resolves an enc/dec
mismatch found in nextgenv2 nightly-run unit test.

Change-Id: I16ab8d6063edf9d2fba79473f470f1a592cc10a0

GrokImageCompression/aom,smarter/aom,mbebenita/aom,luctrudeau/aom,GrokImageCompression/aom,luctrudeau/aom,mbebenita/aom,smarter/aom,mbebenita/aom,GrokImageCompression/aom,luctrudeau/aom,mbebenita/aom,GrokImageCompression/aom,GrokImageCompression/aom,smarter/aom,mbebenita/aom,luctrudeau/aom,mbebenita/aom,luctrudeau/aom,smarter/aom,mbebenita/aom,mbebenita/aom,smarter/aom,smarter/aom,luctrudeau/aom,mbebenita/aom,GrokImageCompression/aom