Fix intra_count_low calculation in first pass
Fix intra_count_low calculation in first pass

In first pass, scaled_low_intra_thresh should not be
compared with motion_error, as scaled_low_intra_thresh
accounts for bit-depth, whereas motion_error does not.
In addition, mv_cost is excluded for comparison.

Change-Id: Id2fa02d364c086876c71ffebb2dd763eaa647e4a

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