[ext-intra] fix bug in sample interpolation when dy < 0
When the "dy" variable is between -1 and 0 (base2 == -1) we should interpolate between the upper-left(-1,-1) and left(-1,0) samples, instead of just taking the left sample. Coding gain improves a bit with this change. BUG=aomedia:357 Change-Id: If520f71b22115e79120499c21f8d6925c1fa24be
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