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vp9: Tune qp_thresh to disable cyclic refresh for screen

For screen-content mode, with aq-mode=3: increase the
qp thresh for disabling the cyclic refresh.
Improves bitrate convergence for content that has been
static for long period.

Change-Id: Ica63a741402923a611ab1b86c0900f75d2d5f941

--- a/vp9/encoder/vp9_aq_cyclicrefresh.c

+++ b/vp9/encoder/vp9_aq_cyclicrefresh.c

@@ -479,7 +479,8 @@

   double weight_segment_target = 0;

   double weight_segment = 0;

   int thresh_low_motion = (cm->width < 720) ? 55 : 20;

-  int qp_thresh = VPXMIN(20, rc->best_quality << 1);

+  int qp_thresh = VPXMIN((cpi->oxcf.content == VP9E_CONTENT_SCREEN) ? 35 : 20,

+                         rc->best_quality << 1);

   cr->apply_cyclic_refresh = 1;

   if (frame_is_intra_only(cm) || cpi->svc.temporal_layer_id > 0 ||

       is_lossless_requested(&cpi->oxcf) ||