Fix comment in convert_saop_to_hashed_saop

[James Coleman]

In 29f45e29 we added support for executing NOT IN(values) with a
hashtable, however this comment still claims that we only do so for
cases where the ScalarArrayOpExpr's useOr flag is true.

See attached for fix.

Thanks,
James Coleman

v1-0001-Fix-convert_saop_to_hashed_saop-comment.patch
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