James Zern 47b9a09120 Resolve -Wshorten-64-to-32 in highbd variance.
For 8-bit the subtrahend is small enough to fit into uint32_t.

This is the same that was done for:
c0241664a Resolve -Wshorten-64-to-32 in variance.

For 10/12-bit apply:
63a37d16f Prevent negative variance

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