Fix cases where a package private nested public class causes a compile error

[SentryMan]

related to #922

resolves issue where the following would fail to compile

interface SomeDao {

  String findById(String id);

  interface SomeMapper {

    SomeDao someDao(String keyspace);
  }
}

@Factory
final class SomeUnrelatedExampleFactory {

  @Bean
  SomeMapper mapper() {
    return null;
  }
}