@embroider/router _getQPMeta looks up "unseen" engine routes

[raycohen]

Without embroider, it is possible for a route within an engine to still short circuit out of _getQPMeta if the engine was loaded if the route has not been "seen".

With embroider, it doesn't matter if the route has been "seen", we only check if the engine bundle has been loaded.

In my app, this results in controllers getting looked up much earlier than they were before, which causes issues in tests because the instance initializes before test setup has been performed.

Would it be possible to match behavior here?