SF: adjust kNonExactMatchingPenalty

Give a higher score to frame rates which exact matches by lowering
the scores for other refresh rates, to favor exact (or multiple)
matches when there are multiple refresh rate with a close value.

Bug: b/190578904
Test: SF unit tests
Change-Id: Ia14551e000ee1651a04ab580c4df2afcb2f8edeb