### 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 = EditorUndoRedoManager::get_singleton();
	switch (drag_type) {
		case DRAG_TYPE_CREATE_TILES:
			undo_redo->create_action(TTR("Create tiles"));
			for (const Vector2i &E : drag_modified_tiles) {
				undo_redo->add_do_method(tile_set_atlas_source, "create_tile", E);
				undo_redo->add_undo_method(tile_set_atlas_source, "remove_tile", E);
			}
			undo_redo->commit_action(false);
			break;
		case DRAG_TYPE_CREATE_BIG_TILE:
			undo_redo->create_action(TTR("Create a tile"));
			undo_redo->add_do_method(tile_set_atlas_source, "create_tile", drag_current_tile, tile_set_atlas_source->get_tile_size_in_atlas(drag_current_tile));
			undo_redo->add_undo_method(tile_set_atlas_source, "remove_tile", drag_current_tile);
			undo_redo->commit_action(false);
			break;
		case DRAG_TYPE_REMOVE_TILES: {
			List<PropertyInfo> list;
			tile_set_atlas_source->get_property_list(&list);
			HashMap<Vector2i, List<const PropertyInfo *>> per_tile = _group_properties_per_tiles(list, tile_set_atlas_source);
			undo_redo->create_action(TTR("Remove tiles"));
			for (const Vector2i &E : drag_modified_tiles) {
				Vector2i coords = E;
				undo_redo->add_do_method(tile_set_atlas_source, "remove_tile", coords);
				undo_redo->add_undo_method(tile_set_atlas_source, "create_tile", coords);