message: Have the theme switcher set the device-level theme to match settings
  Fixes
  This is a shortcut into the Appearance tab, so use the same level. It was an explicit decision to have the tab set the theme at the device level.
diff: @@ -117,7 +117,7 @@ export default class UserMenuButton extends React.Component<IProps, IState> {
  SettingsStore.setValue("use_system_theme", null, SettingLevel.DEVICE, false);
  const newTheme = this.state.isDarkTheme ? "light" : "dark";
  - SettingsStore.setValue("theme", null, SettingLevel.ACCOUNT, newTheme);
  + SettingsStore.setValue("theme", null, SettingLevel.DEVICE, newTheme); // set at same level as Appearance tab
  };
  private onSettingsOpen = (ev: ButtonEvent, tabId: string) => {
  