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When printing types in error messages, we attempt to disambiguate
symbol names by qualifying them in various ways.
Type paramters symbols are qualified by adding `(in someMethod)`.
However, the type errors generated by higher kinded subtyping
can contain clones of type parameter symbols, as creater in
`isPolySubType`. The disambiguation tries fruitlessly to distinguish
them but ended up adding the same suffix to both names repeatedly.
```
found : [F[_]]Foo[[X(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)]Bar[F,X(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)]]
required: Foo[[X(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)]Bar[[X]Or[String,X],X(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)(in type L)]]
```
This commit limits the post qualification of type parameter symbols
to a single attempt to limit the damage. An alternative might
be to mark a clone (we could determine its status by checking whether
it is a type parameter of its owner.) But I'm not sure how to present
this information in a comphrenensible way, so for now I'm limiting
my ambitions to stopping the stutter.
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