File "/usr/lib/python3/dist-packages/electrum/gui/qt/__init__.py", line 167, in toggle_tray_icon
    self.config.set_key("dark_icon", self.dark_icon, True)
  File "/usr/lib/python3/dist-packages/electrum/simple_config.py", line 154, in set_key
    self._set_key_in_user_config(key, value, save)
  File "/usr/lib/python3/dist-packages/electrum/simple_config.py", line 163, in _set_key_in_user_config
    self.save_user_config()
  File "/usr/lib/python3/dist-packages/electrum/simple_config.py", line 243, in save_user_config
    with open(path, "w", encoding='utf-8') as f: