NEW_TOKENSET: Initialise tail probabilities correctly.
NEW_TOKENSET: Initialise tail probabilities correctly.

A bug, but no change to BDR.

Change-Id: I17fbe836fd72d148a4f0608fcff7e2fbcaf75eb0

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