GH-195: Fix cafe-dsl for missed subscriber

Fixes https://github.com/spring-projects/spring-integration-samples/issues/195

After some Java DSL modification to request an explicit subscriber for replies
into a main flow from the `route()`, the `cafe-dsl` has stopped to work

* Remove redundant `defaultOutputToParentFlow()` since it doesn't bring any
value into a flow logic
* add `bridge()` into all the route sub-flows as a thirds subscriber to
make an explicit reply into a main flow after delay and logging

dsl/cafe-dsl/src/main/java/org/springframework/integration/samples/dsl/cafe/lambda/Application.java

@@ -93,7 +93,8 @@ public class Application {
 																" prepared cold drink #" +
 																this.coldDrinkCounter.incrementAndGet() +
 																" for order #" + p.getOrderNumber() + ": " + p)
-												.handle(m -> System.out.println(m.getPayload())))))
+												.handle(m -> System.out.println(m.getPayload()))))
+								.bridge())
 						.subFlowMapping(false, sf -> sf
 								.channel(c -> c.queue(10))
 								.publishSubscribeChannel(c -> c
@@ -104,8 +105,8 @@ public class Application {
 																" prepared hot drink #" +
 																this.hotDrinkCounter.incrementAndGet() +
 																" for order #" + p.getOrderNumber() + ": " + p)
-												.handle(m -> System.out.println(m.getPayload())))))
+												.handle(m -> System.out.println(m.getPayload()))))
-						.defaultOutputToParentFlow())
+								.bridge()))
 				.<OrderItem, Drink>transform(orderItem ->
 						new Drink(orderItem.getOrderNumber(),
 								orderItem.getDrinkType(),