fix(init): Correct java init template (#2889)

Package name included capitalized Subscriptions in the package FQN, which is
incorrect.

Author: RomainMuller

packages/aws-cdk/lib/init-templates/app/java/src/main/java/com/myorg/HelloStack.java

@@ -7,7 +7,7 @@
 import software.amazon.awscdk.services.iam.UserProps;
 import software.amazon.awscdk.services.sns.Topic;
 import software.amazon.awscdk.services.sns.TopicProps;
-import software.amazon.awscdk.services.sns.Subscriptions.SqsSubscription;
+import software.amazon.awscdk.services.sns.subscriptions.SqsSubscription;
 import software.amazon.awscdk.services.sqs.Queue;
 import software.amazon.awscdk.services.sqs.QueueProps;
 

packages/aws-cdk/lib/init-templates/app/java/src/test/java/com/myorg/HelloStackTest.java

@@ -21,7 +21,7 @@ public void testStack() throws IOException {
 
         // synthesize the stack to a CloudFormation template and compare against
         // a checked-in JSON file.
-        JsonNode actual = JSON.valueToTree(app.run().getStack(stack.getName()).getTemplate());
+        JsonNode actual = JSON.valueToTree(app.run().getStack(stack.getStackName()).getTemplate());
         JsonNode expected = JSON.readTree(getClass().getResource("expected.cfn.json"));
         assertEquals(expected, actual);
     }