Cannot summon opaque type typeclass instance if it is defined in object and referred with object prefix

## Compiler version

3.3.0-RC3

## Minimized code

```scala

trait Show[A]

given Show[Long] with {}


object Foo {
  opaque type Id = Long

  summon[Show[Id]] // fine.
  summon[Show[Foo.Id]] // won't compile
}

```

The first summon just fine, but the second not.

Which might be the root cause of https://github.com/lampepfl/dotty/issues/17639

