Orient the camera in CelestialSphere, not World

[eggrobin]

Fix #3235.

The reference rotation is used here:

Principia/ksp_plugin_adapter/planetarium_camera_adjuster.cs

Lines 64 to 76 in 0aa17d4

	// Both the scaled space and galaxy cameras are used in the flight scene as
	// well as map view; they should not be reoriented there.
	if (MapView.MapIsEnabled) {
	PlanetariumCamera.fetch.GetPivot().rotation =
	reference_rotation *
	(UnityEngine.QuaternionD)PlanetariumCamera.fetch.GetPivot().rotation *
	camera_roll;
	ScaledCamera.Instance.galaxyCamera.transform.rotation =
	reference_rotation *
	(UnityEngine.QuaternionD)ScaledCamera.Instance.galaxyCamera.transform.
	rotation *
	camera_roll;
	}

The rotation of the pivot is with respect to World. However, the game compensates for the planetarium rotation, and we only adjust the orientation maintained by the game, we do not maintain an authoritative camera orientation, so that we should not compensate for the planetarium rotation ourselves.