Update ExampleSystemTest.java (#2984)

Fixes #2928 

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- [x] I have followed [Sample Format Guide](https://github.com/GoogleCloudPlatform/java-docs-samples/blob/master/SAMPLE_FORMAT.md)
- [x] `pom.xml` parent set to latest `shared-configuration`
- [ ] Appropriate changes to README are included in PR
- [ ] API's need to be enabled to test (tell us)
- [ ] Environment Variables need to be set (ask us to set them)
- [ ] Tests pass (`mvn -P lint clean verify`)
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Author: kurtisvg

functions/helloworld/hello-http/src/test/java/functions/ExampleSystemTest.java

@@ -38,7 +38,7 @@ public class ExampleSystemTest {
 
   @Test
   public void helloHttp_shouldRunWithFunctionsFramework() throws IOException, InterruptedException {
-    String functionUrl = BASE_URL + "/helloHttp";
+    String functionUrl = BASE_URL + "/HelloHttp";
 
     java.net.http.HttpRequest getRequest =
         java.net.http.HttpRequest.newBuilder().uri(URI.create(functionUrl)).GET().build();