Simplify usage of subscribe options enums

Summary: related to T13606

Reviewers: ivica

Reviewed By: ivica

Subscribers: miljen, iljazovic

Differential Revision: https://repo.mireo.local/D27679

test/integration/read_message.cpp

@@ -203,7 +203,7 @@ BOOST_FIXTURE_TEST_CASE(receive_byte_by_byte, shared_test_data) {
 
 	for (size_t i = 0; i < publish.size(); i++)
 		broker_side.send(
-			std::string { publish[i] }, after(std::chrono::milliseconds(i + 2))
+			std::string { publish[i] }, after(std::chrono::milliseconds(i + 5))
 		);
 
 	auto verify_fun = [&](