Enabling gizmo when NME is open renders gizmo in NME preview panel instead of scene

[PatrickRyanMS]

When a user opens NME from a scene and then enables a gizmo on a mesh in the scene, the gizmo is rendered in the preview window of NME. The gizmo will still control the scene element selected, so the functionality is still active, but it is rendered to the canvas in the child window, not the main canvas.

Repro:

• open https://playground.babylonjs.com/#VJY6H3
• expand the materials list
• launch NME from the node material listed
• leave NME open but switch back to the scene window
• expand the nodes list
• select the mesh in the list
• click on any of the gizmo buttons (translate, rotate, or scale)
• note that the gizmo does not render on the scene object
• toggle back to the NME window and you will see the gizmo rendered in the preview canvas
• interact with the gizmo in the preview canvas of NME and note that the scene object will react.