[Tests] Distributed: Remove workaround for lack of requirement accessors

Author: xedin

test/Distributed/Runtime/distributed_actor_remoteCall_protocol_method_in_presence_of_multiple_systems.swift

@@ -17,7 +17,7 @@ import FakeDistributedActorSystems
 
 @_DistributedProtocol
 protocol GreeterProtocol: DistributedActor where ActorSystem: DistributedActorSystem<any Codable> {
-  distributed func greet() -> String
+  distributed func greet() async throws -> String
 }
 
 // ==== ------------------------------------------------------------------------
@@ -26,6 +26,7 @@ distributed actor DAFR: GreeterProtocol {
   typealias ActorSystem = FakeRoundtripActorSystem
   distributed func greet() -> String { "\(Self.self)" }
 }
+
 distributed actor DAFL: GreeterProtocol {
   typealias ActorSystem = LocalTestingDistributedActorSystem
   distributed func greet() -> String { "\(Self.self)" }
@@ -47,9 +48,6 @@ distributed actor DAFL: GreeterProtocol {
     // - The call is made on the stub: $GreeterProtocol
     // - the record is name is 'HF' for the accessible function
 
-    // FIXME: remove this when we can properly roundtrip through new accessor
-    fakeRoundtripSystem.forceNextRemoteCallReply("FAKE")
-
     let got = try await gfr.greet()
     print("got: \(got)")