vp9: Reduce qp threshold for limiting cyclic refresh on steady blocks.
Makes the delta-qp stop little earlier on areas that have been refreshed enough. This helps to reduce some pulsing artifact on noisy flat areas observed in some noisy vc-clips. Threshold changes only take effect for sources where noise level is estimated to be >= medium level. Only affects 1 pass CBR, non-screen content case. Change-Id: Iacf557f6aa8abbcd6782c02ff2e6c14891960850
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