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

pkg/analysis_server/test/domain_completion_test.dart

Index: pkg/analysis_server/test/domain_completion_test.dart
diff --git a/pkg/analysis_server/test/domain_completion_test.dart b/pkg/analysis_server/test/domain_completion_test.dart
index f988bd609d1e250fd7619bb3d264e877d9da5334..4705a1febee7515fce1e315b9b976759c6b21041 100644
--- a/pkg/analysis_server/test/domain_completion_test.dart
+++ b/pkg/analysis_server/test/domain_completion_test.dart
@@ -31,12 +31,6 @@ main() {
 
 @reflectiveTest
 class CompletionDomainHandlerTest extends AbstractCompletionDomainTest {
-  @override
-  void setUp() {
-    enableNewAnalysisDriver = true;
-    super.setUp();
-  }
-
   test_ArgumentList_constructor_named_param_label() async {
     addTestFile('main() { new A(^);}'
         'class A { A({one, two}) {} }');