fix an broken question.

Fixes #1274.

lib/_debugger.js

@@ -998,7 +998,7 @@ Interface.prototype.yesNoQuestion = function(prompt, cb) {
       cb(false);
     } else {
       console.log('Please answer y or n.');
-      self.restartQuestion(cb);
+      self.yesNoQuestion(prompt, cb);
     }
   });
 };