message: fix off by one error in timing a test that was not previously triggering/checking for delivery properly
diff: @@ -854,7 +854,7 @@ BOOST_FIXTURE_TEST_CASE(deferred_transaction_tests, TESTER) { try {
  auto c = control->applied_transaction.connect([&]( const transaction_trace_ptr& t) { if (t && t->scheduled) { trace = t; ++count; } } );
  CALL_TEST_FUNCTION(*this, "test_transaction", "send_deferred_transaction", {});
  CALL_TEST_FUNCTION(*this, "test_transaction", "send_deferred_transaction", {});
  - produce_block( fc::seconds(2) );
  + produce_blocks( 3 );
  //check that only one deferred transaction executed
  auto dtrxs = control->get_scheduled_transactions();
  