### 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
new_base_tiles_coords = new_base_tiles_coords.max(Vector2i(0, 0)).min(grid_size - Vector2i(1, 1));
				Vector<Point2i> line = Geometry2D::bresenham_line(last_base_tiles_coords, new_base_tiles_coords);
				for (int i = 0; i < line.size(); i++) {
					if (tile_set_atlas_source->get_tile_at_coords(line[i]) == TileSetSource::INVALID_ATLAS_COORDS) {
						tile_set_atlas_source->create_tile(line[i]);
						drag_modified_tiles.insert(line[i]);
					}
				}
				drag_last_mouse_pos = tile_atlas_control->get_local_mouse_position();
			} else if (drag_type == DRAG_TYPE_REMOVE_TILES) {
				
				last_base_tiles_coords = last_base_tiles_coords.max(Vector2i(0, 0)).min(grid_size - Vector2i(1, 1));
				new_base_tiles_coords = new_base_tiles_coords.max(Vector2i(0, 0)).min(grid_size - Vector2i(1, 1));
				Vector<Point2i> line = Geometry2D::bresenham_line(last_base_tiles_coords, new_base_tiles_coords);
				for (int i = 0; i < line.size(); i++) {
					Vector2i base_tile_coords = tile_set_atlas_source->get_tile_at_coords(line[i]);
					if (base_tile_coords != TileSetSource::INVALID_ATLAS_COORDS) {
						drag_modified_tiles.insert(base_tile_coords);
					}
				}
				drag_last_mouse_pos = tile_atlas_control->get_local_mouse_position();
			} else if (drag_type == DRAG_TYPE_MOVE_TILE) {
				
				Vector2 mouse_offset = (Vector2(tile_set_atlas_source->get_tile_size_in_atlas(drag_current_tile)) / 2.0 - Vector2(0.5, 0.5)) * tile_set->get_tile_size();
				Vector2i coords = tile_atlas_view->get_atlas_tile_coords_at_pos(tile_atlas_control->get_local_mouse_position() - mouse_offset);
				if (drag_current_tile != coords && tile_set_atlas_source->has_room_for_tile(coords, tile_set_atlas_source->get_tile_size_in_atlas(drag_current_tile), tile_set_atlas_source->get_tile_animation_columns(drag_current_tile), tile_set_atlas_source->get_tile_animation_separation(drag_current_tile), tile_set_atlas_source->get_tile_animation_frames_count(drag_current_tile), drag_current_tile)) {
					tile_set_atlas_source->move_tile_in_atlas(drag_current_tile, coords);
					selection.clear();
					selection.insert({ coords, 0 });
					drag_current_tile = coords;