### Godot version

v4.2.dev3.official [013e8e3af]

### System information

Windows 11, Core i5-12400F, RX 6600

### Issue description

TileSet->Setup->Separation maybe should have "px" like rest?
![Screenshot 2023-08-21 162202](https://github.com/godotengine/godot/assets/962340/3c6b9a97-7520-4610-8153-7882cc9c303f)
I know this is pixels from testing it.

TileSet->Select is this Animation Separation "px" too? idk
![Screenshot 2023-08-21 162131](https://github.com/godotengine/godot/assets/962340/fcb580e3-9ff7-41d8-92d3-e585841d3803)
I tried setting up animation separation and got a not enough room error, so maybe not "px". idk


Thanks.


### Steps to reproduce

- open TileSet->Setup->Separation, note some have "px" and one doesn't
- open TileSet->Select, is this separation "px" too?


### Minimal reproduction project

n/a
group = tile_data_editors_tree->create_item(root); \
	group->set_custom_bg_color(0, group_color);        \
	group->set_selectable(0, false);                   \
	group->set_disable_folding(true);                  \
	group->set_text(0, text);
	TreeItem *item;
#define ADD_TILE_DATA_EDITOR(parent, text, property)    \
	item = tile_data_editors_tree->create_item(parent); \
	item->set_text(0, text);                            \
	item->set_metadata(0, property);                    \
	if (property == previously_selected) {              \
		item->select(0);                                \
	}
	
	tile_data_editors_tree->add_theme_constant_override("v_separation", 1);
	tile_data_editors_tree->add_theme_constant_override("h_separation", 3);
	Color group_color = get_theme_color(SNAME("prop_category"), SNAME("Editor"));
	
	
	ADD_TILE_DATA_EDITOR_GROUP(TTR("Rendering"));
	ADD_TILE_DATA_EDITOR(group, TTR("Texture Origin"), "texture_origin");
	if (!tile_data_editors.has("texture_origin")) {
		TileDataTextureOriginEditor *tile_data_texture_origin_editor = memnew(TileDataTextureOriginEditor);
		tile_data_texture_origin_editor->hide();
		tile_data_texture_origin_editor->setup_property_editor(Variant::VECTOR2I, "texture_origin");
		tile_data_texture_origin_editor->connect("needs_redraw", callable_mp((CanvasItem *)tile_atlas_control_unscaled, &Control::queue_redraw));
		tile_data_texture_origin_editor->connect("needs_redraw", callable_mp((CanvasItem *)alternative_tiles_control_unscaled, &Control::queue_redraw));
		tile_data_editors["texture_origin"] = tile_data_texture_origin_editor;
	}
	ADD_TILE_DATA_EDITOR(group, TTR("Modulate"), "modulate");