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vp9: 1 pass vbr: Reduce base qp for active_best_quality for inter-frames.

Reduce factor for setting base-qp for active_best_quality (for inter-frames).
Small increase in metrics on yt live set.

Change-Id: I9cf0ac797783aeddbfaf1ff510696c9035d7c5ee

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -956,7 +956,7 @@

       // Use the min of the average Q (with some increase) and

       // active_worst_quality as basis for active_best.

       if (cm->current_video_frame > 1) {

-        q = VPXMIN(((35 * rc->avg_frame_qindex[INTER_FRAME]) >> 5),

+        q = VPXMIN(((17 * rc->avg_frame_qindex[INTER_FRAME]) >> 4),

                     active_worst_quality);

         active_best_quality = inter_minq[q];

       } else {