Reverse the sense of the flag to make it easier to find test that need to be converted

pkg/analysis_server/test/analysis/get_hover_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.
 
 library test.domain.analysis.hover;
 
 import 'dart:async';
 
 import 'package:analysis_server/protocol/protocol.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
@@ skipping 20 matching lines @@
     Request request =
         new AnalysisGetHoverParams(testFile, offset).toRequest('0');
     Response response = await waitResponse(request);
     var result = new AnalysisGetHoverResult.fromResponse(response);
     List<HoverInformation> hovers = result.hovers;
     return hovers.isNotEmpty ? hovers.first : null;
   }
 
   @override
   void setUp() {
-    enableNewAnalysisDriver = true;
     super.setUp();
     createProject();
   }
 
   test_class() async {
     addTestFile('''
 class A<E> {}
 class I1<K, V> {}
 class I2<E> {}
 class M1 {}
@@ skipping 472 matching lines @@
     addTestFile('''
 library my.library;
 main() {
   // nothing
 }
 ''');
     HoverInformation hover = await prepareHover('nothing');
     expect(hover, isNull);
   }
 }