[MINOR] Fix case-sensitive dml script name (federated kmeans)

While win allows for case-insensitive filenames, this is not true on
linux and macos.
diff --git a/src/test/java/org/apache/sysds/test/functions/federated/FederatedKmeansTest.java b/src/test/java/org/apache/sysds/test/functions/federated/FederatedKmeansTest.java
index 1ef2384..a216fb3 100644
--- a/src/test/java/org/apache/sysds/test/functions/federated/FederatedKmeansTest.java
+++ b/src/test/java/org/apache/sysds/test/functions/federated/FederatedKmeansTest.java
@@ -40,7 +40,7 @@
 public class FederatedKmeansTest extends AutomatedTestBase {
 
 	private final static String TEST_DIR = "functions/federated/";
-	private final static String TEST_NAME = "FederatedKMeansTest";
+	private final static String TEST_NAME = "FederatedKmeansTest";
 	private final static String TEST_CLASS_DIR = TEST_DIR + FederatedKmeansTest.class.getSimpleName() + "/";
 
 	private final static int blocksize = 1024;