[FileFormats.LP] fix reading off-diagonals of quadratic functions #2182
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Closes #2181.
This was my fault in #1974. I guess I didn't understand the convention well enough.
It's literally the coefficients as written multiplied by 0.5. Not what MOI does and assume that you're passing one of the off-diagonals. (This is another motivation for changing the definition of ScalarQuadraticFunction in MOI v2 #2180)
Docs: https://www.ibm.com/docs/en/icos/12.8.0.0?topic=representation-quadratic-terms-in-lp-file-format