### Godot version

6ca1bf9589404b7643d8bf6cfb114dacf537f67b

### System information

PopOS 22.04 

### Issue description

The lines drawn to show what the UV1 or UV2 maps look like are way too thick and end up taking up the entire viewport. 

_Beta 13_
![Screenshot from 2023-01-18 13-18-38](https://user-images.githubusercontent.com/16521339/213297096-2e164dc7-355a-4266-821b-99ff21853a77.png)

_Master with a8cbb6245b53955883d8cbeee43524f7bf9fa4af reverted (looks the same in beta 12 and below_
![Screenshot from 2023-01-18 13-16-51](https://user-images.githubusercontent.com/16521339/213297100-415ffde1-972b-428f-b847-5aa64a32c7d2.png)

Regression introduced by https://github.com/godotengine/godot/pull/69851
cc @dalexeev 

Fix is probably going to be removing the editor scaling here: https://github.com/godotengine/godot/blob/6ca1bf9589404b7643d8bf6cfb114dacf537f67b/editor/plugins/mesh_instance_3d_editor_plugin.cpp#L463

### Steps to reproduce

Click on an object with at least a UV map then select "mesh > View UV1"

### Minimal reproduction project

Not project specific
Ref<Mesh> mesh = node->get_mesh();
	if (mesh.is_null()) {
		err_dialog->set_text(TTR("MeshInstance3D lacks a Mesh."));
		err_dialog->popup_centered();
		return;
	}
	if (mesh->get_surface_count() == 0) {
		err_dialog->set_text(TTR("Mesh has no surface to create outlines from."));
		err_dialog->popup_centered();
		return;
	} else if (mesh->get_surface_count() == 1 && mesh->surface_get_primitive_type(0) != Mesh::PRIMITIVE_TRIANGLES) {
		err_dialog->set_text(TTR("Mesh primitive type is not PRIMITIVE_TRIANGLES."));
		err_dialog->popup_centered();
		return;
	}
	Ref<Mesh> mesho = mesh->create_outline(outline_size->get_value());
	if (mesho.is_null()) {
		err_dialog->set_text(TTR("Could not create outline."));
		err_dialog->popup_centered();
		return;
	}
	MeshInstance3D *mi = memnew(MeshInstance3D);
	mi->set_mesh(mesho);
	Node *owner = get_tree()->get_edited_scene_root();
	EditorUndoRedoManager *ur = EditorUndoRedoManager::get_singleton();
	ur->create_action(TTR("Create Outline"));
	ur->add_do_method(node, "add_child", mi, true);
	ur->add_do_method(mi, "set_owner", owner);