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/coroutine.cpp

@@ -80,9 +80,9 @@ asio::awaitable<void> sanity_check(mqtt_client<StreamType, TlsContext>& c) {
 	subscribe_topic sub_topic = subscribe_topic {
 		"test/mqtt-test", async_mqtt5::subscribe_options {
 			qos_e::exactly_once,
-			subscribe_options::no_local_e::no,
-			subscribe_options::retain_as_published_e::retain,
-			subscribe_options::retain_handling_e::send
+			no_local_e::no,
+			retain_as_published_e::retain,
+			retain_handling_e::send
 		}
 	};