Rename settings.contactListAll to settings.allStoredAccounts

[clangenb]

The name is wrong because contactListAll contains the addresses of all accounts on the phone and all contacts on the phone. So we should rename the field to:

/// All addresses stored on the device.
///
/// It contains the accounts and the contacts stored on the device.
@computed
List<AccountData> get contactListAll {
  return List<AccountData>.of(rootStore.account.accountList)..addAll(contactList);
}