### 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
ADD_SIGNAL(MethodInfo("changed", PropertyInfo(Variant::STRING, "what")));
}
void TileSetAtlasSourceEditor::TileSetAtlasSourceProxyObject::edit(Ref<TileSet> p_tile_set, Ref<TileSetAtlasSource> p_tile_set_atlas_source, int p_source_id) {
	ERR_FAIL_COND(!p_tile_set_atlas_source.is_valid());
	ERR_FAIL_COND(p_source_id < 0);
	ERR_FAIL_COND(p_tile_set.is_valid() && p_tile_set->get_source(p_source_id) != p_tile_set_atlas_source);
	if (p_tile_set == tile_set && p_tile_set_atlas_source == tile_set_atlas_source && p_source_id == source_id) {
		return;
	}
	
	if (tile_set_atlas_source.is_valid()) {
		tile_set_atlas_source->disconnect(CoreStringNames::get_singleton()->property_list_changed, callable_mp((Object *)this, &Object::notify_property_list_changed));
	}
	tile_set = p_tile_set;
	tile_set_atlas_source = p_tile_set_atlas_source;
	source_id = p_source_id;
	
	if (tile_set_atlas_source.is_valid()) {
		if (!tile_set_atlas_source->is_connected(CoreStringNames::get_singleton()->property_list_changed, callable_mp((Object *)this, &Object::notify_property_list_changed))) {
			tile_set_atlas_source->connect(CoreStringNames::get_singleton()->property_list_changed, callable_mp((Object *)this, &Object::notify_property_list_changed));
		}
	}
	notify_property_list_changed();
}
bool TileSetAtlasSourceEditor::AtlasTileProxyObject::_set(const StringName &p_name, const Variant &p_value) {