vp9-rtc: Add cyclic_refresh condition to segment reset

vp9-rtc: Add cyclic_refresh condition to segment reset

In non-rd pickmode for screen content:
this logic to reset segment should only be for cyclic_refresh
mode on, so add that condition explicitly.

There may be other uses of segments, like ROI, so we
should condition this reset logic on cyclic_refresh,
as it was intended for that mode only.

Change-Id: I954e6cee968fbca35b34286c4a7ca2531c8e9823