message: fix minor mistake in multi_index test case
diff: @@ -98,7 +98,6 @@ namespace _test_multi_index {
  eosio_assert(itr == secondary_index.end(), "idx64_general - increment secondary iterator to end");
  }
  - /*
  // iterate backward staring with second bob
  {
  auto ptr = table.find(781);
  @@ -109,7 +108,7 @@ namespace _test_multi_index {
  eosio_assert(itr->id == 781 && itr->sec == N(bob), "idx64_general - iterator to existing object in secondary index");
  --itr;
  - eosio_assert(itr != secondary_index.end() && itr->id == 781 && itr->sec == N(bob), "idx64_general - decrement secondary iterator");
  + eosio_assert(itr != secondary_index.end() && itr->id == 540 && itr->sec == N(bob), "idx64_general - decrement secondary iterator");
  --itr;
  eosio_assert(itr != secondary_index.end() && itr->id == 650 && itr->sec == N(allyson), "idx64_general - decrement secondary iterator again");
  @@ -120,7 +119,6 @@ namespace _test_multi_index {
  --itr; // Decrementing an iterator at the beginning (technically undefined behavior) turns it into end(). Is this desired?
  eosio_assert(itr == secondary_index.end(), "idx64_general - decrement secondary iterator that was already at beginning");
  }
  - */
  // update and remove
  {
  