mypy: Fix new issues in statusbar.url

qutebrowser/mainwindow/statusbar/url.py

@@ -42,17 +42,10 @@ class UrlText(textbase.TextBase):
         _normal_url_type: The type of the normal URL as a UrlType instance.
         _hover_url: The URL we're currently hovering over.
         _ssl_errors: Whether SSL errors occurred while loading.
-
-    Class attributes:
         _urltype: The URL type to show currently (normal/ok/error/warn/hover).
                   Accessed via the urltype property.
-
-                  For some reason we need to have this as class attribute so
-                  pyqtProperty works correctly.
     """
 
-    _urltype = None
-
     STYLESHEET = """
         QLabel#UrlText[urltype="normal"] {
             color: {{ conf.colors.statusbar.url.fg }};
@@ -81,6 +74,7 @@ class UrlText(textbase.TextBase):
 
     def __init__(self, parent=None):
         super().__init__(parent)
+        self._urltype = None
         self.setObjectName(self.__class__.__name__)
         config.set_register_stylesheet(self)
         self._hover_url = None