message: upgrade some error checks I missed to use new assertion failure message
diff: @@ -2122,10 +2122,10 @@ BOOST_FIXTURE_TEST_CASE(producer_onblock_check, eosio_system_tester) try {
  {
  BOOST_CHECK_EQUAL(0, get_global_state()["total_unpaid_blocks"].as<uint32_t>());
  - BOOST_REQUIRE_EQUAL(error("condition: assertion failed: not enough has been staked for producers to claim rewards"),
  + BOOST_REQUIRE_EQUAL(wasm_assert_msg("not enough has been staked for producers to claim rewards"),
  push_action(producer_names.front(), N(claimrewards), mvo()("owner", producer_names.front())));
  BOOST_REQUIRE_EQUAL(0, get_balance(producer_names.front()).amount);
  - BOOST_REQUIRE_EQUAL(error("condition: assertion failed: not enough has been staked for producers to claim rewards"),
  + BOOST_REQUIRE_EQUAL(wasm_assert_msg("not enough has been staked for producers to claim rewards"),
  push_action(producer_names.back(), N(claimrewards), mvo()("owner", producer_names.back())));
  BOOST_REQUIRE_EQUAL(0, get_balance(producer_names.back()).amount);
  }
  