Use helper for feature flag in test

Author: acogoluegnes

deps/rabbit/test/amqp_connection_uniqueness_SUITE.erl

@@ -22,7 +22,7 @@
         [has_capability/2]).
 
 -import(rabbit_ct_broker_helpers,
-        [rpc/5,
+        [enable_feature_flag/2,
          rpc_all/4]).
 
 all() ->
@@ -67,8 +67,7 @@ init_per_group(Group, Config) ->
                 rabbit_ct_client_helpers:setup_steps()),
     case Nodes > 1 of
         true ->
-            case rpc(Config2, 0, rabbit_feature_flags,
-                     enable, ['rabbitmq_4.4.0']) of
+            case enable_feature_flag(Config2, 'rabbitmq_4.4.0') of
                 ok ->
                     Config2;
                 _ ->