removeOption method
- String name
Remove the option named name from userPrefs.
If lockedPrefs contains this option it will not be removed.
Returns true if userPrefs was removed, false if it was not removed
because userPrefs doesn't contain it because lockedPrefs
contains it.
Implementation
bool removeOption(String name) {
  final option = _userPrefs.firstWhere((o) => o.name == name,
      orElse: () => InvalidOption(name));
  if (option is InvalidOption) {
    return false;
  }
  return _userPrefs.remove(option);
}