Change Qlimit for arf kf.
The limits applied under the flag "LIMIT_QRANGE_FOR_ALTREF_AND_KEY" behaved in an undesirable way if the gap between active_worst_quality and active_best_quality was changed. In this patch, the adjustment is made using the vp9_compute_qdelta_by_rate() function and fixed rate multiplier values. Hence it is not impacted by the relative value of active_best_quality. Change-Id: I93b3308e04ade1e4eb5af63edf64f91cd3700249
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