### 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
Vector2i coords = tile_set_atlas_source->get_tile_at_coords(start_base_tiles_coords);
				if (coords != TileSetSource::INVALID_ATLAS_COORDS) {
					if (selection.has({ coords, 0 })) {
						add_to_selection = false;
					}
				}
			} else {
				selection.clear();
			}
			
			for (int x = region.position.x; x < region.get_end().x; x++) {
				for (int y = region.position.y; y < region.get_end().y; y++) {
					Vector2i coords = Vector2i(x, y);
					coords = tile_set_atlas_source->get_tile_at_coords(coords);
					if (coords != TileSetSource::INVALID_ATLAS_COORDS) {
						if (add_to_selection && !selection.has({ coords, 0 })) {
							selection.insert({ coords, 0 });
						} else if (!add_to_selection && selection.has({ coords, 0 })) {
							selection.erase({ coords, 0 });
						}
					}
				}
			}
			_update_tile_inspector();
			_update_tile_id_label();
			_update_current_tile_data_editor();
			undo_redo->add_do_method(this, "_set_selection_from_array", _get_selection_as_array());
			undo_redo->commit_action(false);
		} break;
		case DRAG_TYPE_MAY_POPUP_MENU: {