### 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
EditorUndoRedoManager *undo_redo_man = Object::cast_to<EditorUndoRedoManager>(p_undo_redo);
	ERR_FAIL_NULL(undo_redo_man);
#define ADD_UNDO(obj, property) undo_redo_man->add_undo_property(obj, property, obj->get(property));
	AtlasTileProxyObject *tile_data_proxy = Object::cast_to<AtlasTileProxyObject>(p_edited);
	if (tile_data_proxy) {
		UndoRedo *internal_undo_redo = undo_redo_man->get_history_for_object(tile_data_proxy).undo_redo;
		internal_undo_redo->start_force_keep_in_merge_ends();
		Vector<String> components = String(p_property).split("/", true, 2);
		if (components.size() == 2 && components[1] == "polygons_count") {
			int layer_index = components[0].trim_prefix("physics_layer_").to_int();
			int new_polygons_count = p_new_value;
			int old_polygons_count = tile_data_proxy->get(vformat("physics_layer_%d/polygons_count", layer_index));
			if (new_polygons_count < old_polygons_count) {
				for (int i = new_polygons_count; i < old_polygons_count; i++) {
					ADD_UNDO(tile_data_proxy, vformat("physics_layer_%d/polygon_%d/points", layer_index, i));
					ADD_UNDO(tile_data_proxy, vformat("physics_layer_%d/polygon_%d/one_way", layer_index, i));
					ADD_UNDO(tile_data_proxy, vformat("physics_layer_%d/polygon_%d/one_way_margin", layer_index, i));
				}
			}
		} else if (p_property == "terrain_set") {
			int current_terrain_set = tile_data_proxy->get("terrain_set");
			ADD_UNDO(tile_data_proxy, "terrain");
			for (int i = 0; i < TileSet::CELL_NEIGHBOR_MAX; i++) {
				TileSet::CellNeighbor bit = TileSet::CellNeighbor(i);
				if (tile_set->is_valid_terrain_peering_bit(current_terrain_set, bit)) {
					ADD_UNDO(tile_data_proxy, "terrains_peering_bit/" + String(TileSet::CELL_NEIGHBOR_ENUM_TO_TEXT[i]));
				}