message: [functional_tests] Check the correct capability flag in test
  Fixes what is presumably a copy-paste error.
  Updated the remove_then_replace_rotation_capability test to check that the rotation capability is no longer delegated when restored rather than checking if the withdrawal capability is delegated.
  Closes:
  Approved by: vgao1996
diff: @@ -16,7 +16,7 @@ main() {
  // restoring the capability should flip the flag back
  LibraAccount.restore_key_rotation_capability(move(cap));
  - assert(!LibraAccount.delegated_withdrawal_capability(copy(sender)), 52);
  + assert(!LibraAccount.delegated_key_rotation_capability(copy(sender)), 52);
  // and the sender should be able to rotate once again
  LibraAccount.rotate_authentication_key(AddressUtil.address_to_bytes(move(sender)));
  