vp9: Fix to quality regression issue for 1 pass.
BUG=https://bugs.chromium.org/p/webm/issues/detail?id=1217 Issue introduced in https://chromium-review.googlesource.com/#/c/339162/. The factor on avg_frame_qindex[INTER_FRAME] in that CL, used for q-basis to set active_best, can cause the QP to decrease too slowly or get stuck in some cases when max-q=63. Removing that factor fixes the regression in issue#1217. Change-Id: I97fe28dca3c2bc2d852b1775f39c62164e032d4f
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