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vp9-rtc: Increase qp thresh for overshoot detection

For video mode (non-screen) in CBR real-time mode:
increase the qp thresh to trigger setting to active_worst
on scene changes. Avoid big overshoots in content with
scene changes.

Change-Id: I74721b07b0d7b742cbef468ece70cca7da0f89eb

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

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

@@ -3044,7 +3044,7 @@

   // Lower thresh_qp for video (more overshoot at lower Q) to be

   // more conservative for video.

   if (cpi->oxcf.content != VP9E_CONTENT_SCREEN)

-    thresh_qp = rc->worst_quality >> 1;

+    thresh_qp = 3 * (rc->worst_quality >> 2);

   // If this decision is not based on an encoded frame size but just on

   // scene/slide change detection (i.e., re_encode_overshoot_cbr_rt ==

   // FAST_DETECTION_MAXQ), for now skip the (frame_size > thresh_rate)