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

pkg/analysis_server/test/analysis_abstract.dart

Index: pkg/analysis_server/test/analysis_abstract.dart
diff --git a/pkg/analysis_server/test/analysis_abstract.dart b/pkg/analysis_server/test/analysis_abstract.dart
index f749017819da46a3ce158123df466031c39ade14..9b7a3640a8357997c691fa5396b56ffa0bfe5791 100644
--- a/pkg/analysis_server/test/analysis_abstract.dart
+++ b/pkg/analysis_server/test/analysis_abstract.dart
@@ -52,7 +52,6 @@ int findIdentifierLength(String search) {
  * An abstract base for all 'analysis' domain tests.
  */
 class AbstractAnalysisTest {
-  bool enableNewAnalysisDriver = false;
   bool generateSummaryFiles = false;
   MockServerChannel serverChannel;
   MemoryResourceProvider resourceProvider;
@@ -80,6 +79,8 @@ class AbstractAnalysisTest {
       ? testDiver.analysisOptions
       : testContext.analysisOptions;
 
+  bool get enableNewAnalysisDriver => true;
+
   AnalysisContext get testContext => server.getAnalysisContext(testFile);
 
   AnalysisDriver get testDiver => server.getAnalysisDriver(testFile);