Don't quit debugger when the program terminates, only after `quit`.

tests/debugger/list_processes_test.dart

 // Copyright (c) 2016, the Dartino project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE.md file.
 
 // Test that we get a meaningful list of processes.
 
-// DartinoDebuggerCommands=b resume,r,lp,c,lp,c
+// DartinoDebuggerCommands=b resume,r,lp,c,lp,c,q
 
 import 'dart:async';
 import 'dart:dartino';
 import 'package:expect/expect.dart';
 
 Port spawnPaused(Channel channel, Channel monitor) {
   var port = new Port(channel);
   Process.spawnDetached(() {
       var c = new Channel();
       port.send(new Port(c));
@@ skipping 15 matching lines @@
   Port p1 = spawnPaused(channel, monitor);
   Port p2 = spawnPaused(channel, monitor);
   // Give the children time to block at B1.
   Timer timer = new Timer(const Duration(seconds: 2), () {
     resume(channel, p2);
     Expect.equals(DeathReason.Terminated, monitor.receive().reason);
     resume(channel, p1);
     Expect.equals(DeathReason.Terminated, monitor.receive().reason);
   });
 }