Fix KNN test formatting

Author: poorva0405

src/test/java/com/thealgorithms/machinelearning/KNearestNeighborsTest.java

@@ -244,5 +244,4 @@ void fitMakesDefensiveCopyOfTrainingData() {
 
         assertEquals(0, knn.predict(new double[] {0, 0}));
     }
-
 }