[results feed] Change default view to "active failures"

The URL query fragment now shows "showLatestFailures=false" for the
"all results" view, and nothing for the "active failures" view.
Previous URL fragments remain valid, and "showLatestFailures=true" is
ignored.

Change-Id: Ibd2c55cc94721b89b9befc557f582298148e55a9
Reviewed-on: https://dart-review.googlesource.com/c/dart_ci/+/149180
Reviewed-by: Alexander Thomas <athom@google.com>
diff --git a/results_feed/lib/src/services/filter_service.dart b/results_feed/lib/src/services/filter_service.dart
index 2dc2e02..000f9ac 100644
--- a/results_feed/lib/src/services/filter_service.dart
+++ b/results_feed/lib/src/services/filter_service.dart
@@ -78,7 +78,7 @@
     return result;
   }
 
-  static const defaultShowLatestFailures = false;
+  static const defaultShowLatestFailures = true;
   static const defaultShowUnapprovedOnly = false;
   static const allConfigurationGroups = <String>[
     'analyzer',