[ CLI ] Make tooling-daemon command visible with --verbose

Change-Id: I298302afb628cb67887e39f616482a2071d2bc52
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/349020
Reviewed-by: Dan Chevalier <danchevalier@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>

pkg/dartdev/lib/src/commands/tooling_daemon.dart

@@ -23,9 +23,7 @@ class ToolingDaemonCommand extends DartdevCommand {
           commandName,
           commandDescription,
           verbose,
-          // TODO: this should be set to !verbose once DTD is ready for
-          // production.
-          hidden: true,
+          hidden: !verbose,
         );
 
   @override