Style: Apply new changes from clang-format 8.0

It seems to stay compatible with formatting done by clang-format 6.0 and 7.0,
so contributors can keep using those versions for now (they will not undo those
changes).

core/packed_data_container.cpp

@@ -319,7 +319,8 @@ uint32_t PackedDataContainer::_pack(const Variant &p_data, Vector<uint8_t> &tmpd
 
 		} break;
 
-		default: {}
+		default: {
+		}
 	}
 
 	return OK;