Fix :config-unset

qutebrowser/config/config.py

@@ -401,12 +401,8 @@ class Config(QObject):
 
     def unset(self, name, *, save_yaml=False, pattern=None):
         """Set the given setting back to its default."""
-        self.get_opt(name)
-        values = self._get_values(pattern)
-        try:
-            del values[name]
-        except KeyError:
-            return
+        self.get_opt(name)  # To check whether it exists
+        self._values[name].remove(pattern)
         self.changed.emit(name)
 
         if save_yaml: