vp10: remove double MV value check.
This has virtually no effect on coding efficiency, but it is more logical from a theoretical perspective (since it makes no sense to me that you would exclude a MV from a list just because it's sign- inversed value is identical to a value already in a list), and it also makes the code simpler (it removes a duplicate value check in cases where signbias is equal between the two MVs being compared). See issue 662. Change-Id: I23e607c6de150b9f11d1372fb2868b813c322d37
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