Be more explicit in make_unique for AppleClang

Author: wravery

test/ClientTests.cpp

@@ -132,11 +132,11 @@ TEST_F(ClientCase, MutateCompleteTask)
 	using namespace client::mutation::CompleteTaskMutation;
 
 	auto query = GetRequestObject();
-	auto variables =
-		serializeVariables({ std::make_unique<Variables::CompleteTaskInput>(today::getFakeTaskId(),
+	auto variables = serializeVariables({ std::make_unique<Variables::CompleteTaskInput>(
+		Variables::CompleteTaskInput { today::getFakeTaskId(),
 			std::nullopt,
 			std::make_optional(true),
-			std::make_optional("Hi There!"s)) });
+			std::make_optional("Hi There!"s) }) });
 
 	auto state = std::make_shared<today::RequestState>(5);
 	auto result =