### 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
HashMap<Vector2i, List<const PropertyInfo *>> per_tile;
	for (const List<PropertyInfo>::Element *E_property = r_list.front(); E_property; E_property = E_property->next()) {
		Vector<String> components = String(E_property->get().name).split("/", true, 1);
		if (components.size() >= 1) {
			Vector<String> coord_arr = components[0].split(":");
			if (coord_arr.size() == 2 && coord_arr[0].is_valid_int() && coord_arr[1].is_valid_int()) {
				Vector2i coords = Vector2i(coord_arr[0].to_int(), coord_arr[1].to_int());
				per_tile[coords].push_back(&(E_property->get()));
			}
		}
	}
	return per_tile;
}
void TileSetAtlasSourceEditor::_menu_option(int p_option) {