Format all multitests

tests/language/regress_21793_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Regression test for issue 21793.
 
 import 'package:expect/expect.dart';
 
 /* //  //# 01: static type warning, runtime error
-class A { call(x) => x; }
+class A {
+  call(x) => x;
+}
 */ //  //# 01: continued
 
 main() {
   print(new A()(499));
 }