Simplify variable naming in tcDataKindSig
Simplify variable naming in tcDataKindSig

Now that we are very consistent about tidying when converting
to IfaceSyn, we don't need to worry about accidental capture
of the "extra" type variables in tcDataKindSig.  (Previously
we gave them weird names like $a.)

However, it is nicer for the user if we don't gratuitously
re-use an in-scope name, so we take care not to do that
.

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