variance aq: Fix a variance calculation overflow bug.
This is an actual overflow where the result of the calculation is materially changed, not just a negative value that is stored in an unsigned. Caught with fsanitize=integer on the VP9/AqSegmentTest.TestNoMisMatchAQ2/1 test. Change-Id: I514b0ef4ae7ad50e3e08c0079aa204d59fa679aa
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