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

pkg/analysis_server/test/search/element_references_test.dart

Index: pkg/analysis_server/test/search/element_references_test.dart
diff --git a/pkg/analysis_server/test/search/element_references_test.dart b/pkg/analysis_server/test/search/element_references_test.dart
index 71c29f993e2eec835e20bfe5e4af4db5e521853b..e21ec9a39a6c7dd700cf9d3e27c3459966e95bc0 100644
--- a/pkg/analysis_server/test/search/element_references_test.dart
+++ b/pkg/analysis_server/test/search/element_references_test.dart
@@ -21,6 +21,9 @@ main() {
 class ElementReferencesTest extends AbstractSearchDomainTest {
   Element searchElement;
 
+  @override
+  bool get enableNewAnalysisDriver => false;
+
   void assertHasRef(SearchResultKind kind, String search, bool isPotential) {
     assertHasResult(kind, search);
     expect(result.isPotential, isPotential);
@@ -43,12 +46,6 @@ class ElementReferencesTest extends AbstractSearchDomainTest {
     expect(serverErrors, isEmpty);
   }
 
-  @override
-  void setUp() {
-    enableNewAnalysisDriver = false;
-    super.setUp();
-  }
-
   test_constructor_named() async {
     addTestFile('''
 class A {