"Dark matter" can't contribute directly to fusion, because it interacts with the rest of matter only via gravity. (And possibly the weak force, but the fusion reactions we've observed don't depend on anything except the high-energy hydrogen.)

The fusion reactions of the Sun are driven by gravity: the pressure caused by gravity pushes the hydrogens together until they can fuse.

There may well be dark matter in the sun, but it's extremely diffuse and does not contribute to that gravity. The total amount of dark matter in the galaxy is very large, but it's spread more evenly through space than the regular matter is, which tends to clump. That means that there's an immeasurably small amount of dark matter in the sun, if any.

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