Remove the now unnecessary flag from test files

tests/language/initializing_formal_scope_test.dart

 // Copyright (c) 2016, 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.
-//
-// DartOptions=--initializing-formal-access
-// VMOptions=--initializing-formal-access
 
 import "package:expect/expect.dart";
 
 // Duplicate definition checks for `this.x` will check the scopes associated
 // with the constructor, not all enclosing scopes; so this is not a conflict.
 var x;
 
 class A {
   var x;
   A(this.x) {
     // In the body the field is in scope, not the initializing formal;
     // so we can use the setter.
     x += 1;
   }
 }
 
 main() {
   A a = new A(2);
   Expect.equals(a.x, 3);
 }