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vp8: Increase rate threshold for overshoot-drop

Increase the rate threshold for the dropping when
overshoot is detected during encoding. This helps
to prevent some unneccessary drops for hard content.

Change-Id: I258bf33883d46347efd44e1e192cb25c444d05fe

--- a/vp8/encoder/ratectrl.c

+++ b/vp8/encoder/ratectrl.c

@@ -1474,7 +1474,7 @@

     // QP threshold: only allow dropping if we are not close to qp_max.

     int thresh_qp = 3 * cpi->worst_quality >> 2;

     // Rate threshold, in bytes.

-    int thresh_rate = 2 * (cpi->av_per_frame_bandwidth >> 3);

+    int thresh_rate = 3 * (cpi->av_per_frame_bandwidth >> 3);

     // Threshold for the average (over all macroblocks) of the pixel-sum

     // residual error over 16x16 block.

     int thresh_pred_err_mb = (200 << 4);