Remove current module from nested types

[gentlegiantJGC]

Types like union types have nested types in them.
The current implementation only removes the current module name from the root type name.
This modifies that behaviour so that it expands nested types recursively.
I discovered this through a mypy error that the module had not been imported.

Current behaviour

class Foo:
    pass

def test(arg: list[module.Foo] | module.Foo]) -> None: ...

Expected behaviour

class Foo:
    pass

def test(arg: list[Foo] | Foo]) -> None: ...