The old method would propose the erasure of the type param if the
compliance was set pre 1.5.

Instead, now two quickfixes are always proposed:
1. Replace the return type with the erasure
2. Introduce a new type param with the same bounds,
   importing the bounds and adding the type variable for any raw types

Fixes #1558

Signed-off-by: David Thompson <davthomp@redhat.com>