Don't pass prompt object to prompter.

qutebrowser/widgets/statusbar/prompt.py

@@ -66,7 +66,7 @@ class Prompt(QWidget):
         self.lineedit = PromptLineEdit()
         self._hbox.addWidget(self.lineedit)
 
-        prompter_obj = prompter.Prompter(self)
+        prompter_obj = prompter.Prompter()
         objreg.register('prompter', prompter_obj)
 
     def __repr__(self):

qutebrowser/widgets/statusbar/prompter.py

@@ -62,8 +62,8 @@ class Prompter:
         _queue: A deque of waiting questions.
     """
 
-    def __init__(self, prompt):
-        self.question = None
+    def __init__(self):
+        self._question = None
         self._loops = []
         self._queue = collections.deque()
         self._busy = False