Don't show line edit text in its repr().

Previously we showed self.text in the __repr__ of MinimalLineEdit. This however
is a bad idea, because it exposes passwords to the debug log when the currently
focused widget is logged.

qutebrowser/misc/miscwidgets.py

@@ -43,7 +43,7 @@ class MinimalLineEditMixin:
         self.setAttribute(Qt.WA_MacShowFocusRect, False)
 
     def __repr__(self):
-        return utils.get_repr(self, text=self.text())
+        return utils.get_repr(self)
 
 
 class CommandLineEdit(QLineEdit):