Vertex and edge aiding displays no longer show on the viewport

[Nevur]

Describe the bug
Viewport display for vertexes, edges, etc. no longer work, making working with the plugin considerably more difficult.
They can still be selected and manipulated, however.

To Reproduce
Steps to reproduce the behavior:

1. Create a MeshInstance and assign it a PlyEditor node.
2. Generate a primitive cube or load any other mesh.

Expected behavior
Vertexes and edges should display squares and lines respectively, but they no longer do.

Screenshots

Additional context

[MineBill]

See if #79 fixes it.

[Nevur]

Yes, this PR fixes it.

[fire]

I merged the pr in and it is still broken on Godot Engine 4.1,