Add `px` suffix to TileSet `Separation` value

Add px suffix to TileSet separation value

editor/plugins/tiles/tile_set_atlas_source_editor.cpp

@@ -111,7 +111,7 @@ void TileSetAtlasSourceEditor::TileSetAtlasSourceProxyObject::_get_property_list
 	p_list->push_back(PropertyInfo(Variant::STRING, PNAME("name")));
 	p_list->push_back(PropertyInfo(Variant::OBJECT, PNAME("texture"), PROPERTY_HINT_RESOURCE_TYPE, "Texture2D"));
 	p_list->push_back(PropertyInfo(Variant::VECTOR2I, PNAME("margins"), PROPERTY_HINT_NONE, "suffix:px"));
-	p_list->push_back(PropertyInfo(Variant::VECTOR2I, PNAME("separation")));
+	p_list->push_back(PropertyInfo(Variant::VECTOR2I, PNAME("separation"), PROPERTY_HINT_NONE, "suffix:px"));
 	p_list->push_back(PropertyInfo(Variant::VECTOR2I, PNAME("texture_region_size"), PROPERTY_HINT_NONE, "suffix:px"));
 	p_list->push_back(PropertyInfo(Variant::BOOL, PNAME("use_texture_padding")));
 }