### 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
emit_signal(SNAME("changed"), "atlas_coords");
				return true;
			} else if (p_name == "size_in_atlas") {
				Vector2i as_vector2i = Vector2i(p_value);
				bool has_room_for_tile = tile_set_atlas_source->has_room_for_tile(coords, as_vector2i, tile_set_atlas_source->get_tile_animation_columns(coords), tile_set_atlas_source->get_tile_animation_separation(coords), tile_set_atlas_source->get_tile_animation_frames_count(coords), coords);
				ERR_FAIL_COND_V_EDMSG(!has_room_for_tile, false, "Invalid size or not enough room in the atlas for the tile.");
				tile_set_atlas_source->move_tile_in_atlas(coords, TileSetSource::INVALID_ATLAS_COORDS, as_vector2i);
				emit_signal(SNAME("changed"), "size_in_atlas");
				return true;
			}
		} else if (alternative > 0) {
			if (p_name == "alternative_id") {
				int as_int = int(p_value);
				ERR_FAIL_COND_V(as_int < 0, false);
				ERR_FAIL_COND_V_MSG(tile_set_atlas_source->has_alternative_tile(coords, as_int), false, vformat("Cannot change alternative tile ID. Another alternative exists with id %d for tile at coords %s.", as_int, coords));
				if (tiles_set_atlas_source_editor->selection.front()->get().alternative == alternative) {
					tiles_set_atlas_source_editor->selection.clear();
					tiles_set_atlas_source_editor->selection.insert({ coords, as_int });
				}
				int previous_alternative_tile = alternative;
				tiles.clear();
				tiles.insert({ coords, as_int }); 
				tile_set_atlas_source->set_alternative_tile_id(coords, previous_alternative_tile, as_int);
				emit_signal(SNAME("changed"), "alternative_id");
				return true;
			}
		}
	}