### 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
if (per_tile.has(coords)) {
					for (List<const PropertyInfo *>::Element *E_property = per_tile[coords].front(); E_property; E_property = E_property->next()) {
						String property = E_property->get()->name;
						Variant value = tile_set_atlas_source->get(property);
						if (value.get_type() != Variant::NIL) {
							undo_redo->add_undo_method(tile_set_atlas_source, "set", E_property->get()->name, value);
						}
					}
				}
			}
			undo_redo->commit_action();
		} break;
		case DRAG_TYPE_CREATE_TILES_USING_RECT: {
			Vector2i start_base_tiles_coords = tile_atlas_view->get_atlas_tile_coords_at_pos(drag_start_mouse_pos, true);
			Vector2i new_base_tiles_coords = tile_atlas_view->get_atlas_tile_coords_at_pos(tile_atlas_control->get_local_mouse_position(), true);
			Rect2i area = Rect2i(start_base_tiles_coords, new_base_tiles_coords - start_base_tiles_coords).abs();
			area.set_end((area.get_end() + Vector2i(1, 1)).min(tile_set_atlas_source->get_atlas_grid_size()));
			undo_redo->create_action(TTR("Create tiles"));
			for (int x = area.get_position().x; x < area.get_end().x; x++) {
				for (int y = area.get_position().y; y < area.get_end().y; y++) {
					Vector2i coords = Vector2i(x, y);
					if (tile_set_atlas_source->get_tile_at_coords(coords) == TileSetSource::INVALID_ATLAS_COORDS) {
						undo_redo->add_do_method(tile_set_atlas_source, "create_tile", coords);
						undo_redo->add_undo_method(tile_set_atlas_source, "remove_tile", coords);
					}
				}
			}
			undo_redo->commit_action();
		} break;
		case DRAG_TYPE_REMOVE_TILES_USING_RECT: {