DynamicTexture example input broken

Previously it was possible interact with the 2D overlay panel by moving the notes around, and editing them, which doesn't seem possible anymore.  It should also be possible to open the "doors" in the 3D scene.

With 6.1.0 it should also be possible to interact with the "notes" via the 3D scene, but that doesn't appear possible in a meaningful way in the current release (seems to have been broken sometime in between feature development and now).