Count supertypes when collecting module types (#6838)

Previously we included supertypes, but did not increase their count.
This was done so that the output for the nominal type system, which
introduced explicitly supertypes, would more closely match the output
with the old equirecursive types system. Neither type system exists
anymore and we only support the single, standard isorecursive type
system, so we can now properly count supertypes. It turns out it doesn't
make much of a difference in the test outputs anyway.

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