Fix call graph for stub update handler (#256)

Author: Maria Ines Parnisari

python/rpdk/java/templates/init/guided_aws/StubUpdateHandler.java

@@ -35,7 +35,7 @@ protected ProgressEvent<ResourceModel, CallbackContext> handleRequest(
             // STEP 1 [first update/stabilize progress chain - required for resource update]
             .then(progress ->
                 // STEP 1.0 [initialize a proxy context]
-                proxy.initiate("AWS-Foo-Bar::Update", proxyClient, model, callbackContext)
+                proxy.initiate("{{ call_graph }}::{{ operation }}", proxyClient, model, callbackContext)
 
                     // STEP 1.1 [TODO: construct a body of a request]
                     .translateToServiceRequest(Translator::translateToFirstUpdateRequest)
@@ -53,7 +53,7 @@ protected ProgressEvent<ResourceModel, CallbackContext> handleRequest(
             // STEP 2 [second update/stabilize progress chain]
             .then(progress ->
                     // STEP 2.0 [initialize a proxy context]
-                    proxy.initiate("AWS-Foo-Bar::Update", proxyClient, model, callbackContext)
+                    proxy.initiate("{{ call_graph }}::{{ operation }}", proxyClient, model, callbackContext)
 
                     // STEP 2.1 [TODO: construct a body of a request]
                     .translateToServiceRequest(Translator::translateToSecondUpdateRequest)