Ensure 2D LowLevel Physics correctly uses ElementDepth for TransformPlanes

When using TransformPlane with a non-orthographic camera, we momentarily show the gizmos at the wrong element depth.

This is caused by how shapes are rendered, not applying element depth.

This is demonstrated in this example which, when pressing "Play" will show the gizmo at the wrong depth for a single frame.

https://github.com/Unity-Technologies/PhysicsExamples2D/blob/master/LowLevel/Projects/Primer/Assets/Examples/15%20-%20TransformPlaneWrite.unity