Relax SQNR check for mv2

[JacobSzwejbka]

Summary: Check has been failing and other quant models use 15 so it seems fine.

Differential Revision: D101837680

[pytorch-bot]

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@JacobSzwejbka has exported this pull request. If you are a Meta employee, you can view the originating Diff in D101837680.

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