vp9: 1 pass vbr: small adjustment to active_best factor for inter.

Change-Id: I9c68aa9e72969b0ffbf57eb186380ff666745aeb

vp9/encoder/vp9_ratectrl.c

diff --git a/vp9/encoder/vp9_ratectrl.c b/vp9/encoder/vp9_ratectrl.c
index 1b17d4e..59f508c 100644
--- a/vp9/encoder/vp9_ratectrl.c
+++ b/vp9/encoder/vp9_ratectrl.c
@@ -952,7 +952,7 @@
       // 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(((17 * rc->avg_frame_qindex[INTER_FRAME]) >> 4),
+        q = VPXMIN(((35 * rc->avg_frame_qindex[INTER_FRAME]) >> 5),
                     active_worst_quality);
         active_best_quality = inter_minq[q];
       } else {