Fix formatting in CorrelationTest.java

Author: kvadrik

src/test/java/com/thealgorithms/maths/CorrelationTest.java

@@ -28,7 +28,7 @@ public void testCorrelationConstant() {
         double[] y = {4, 4, 4};
         int n = 3;
         assertEquals(0, Correlation.correlation(x, y, n), DELTA);
-	}
+    }
 
     public void testCorrelationLinearDependence() {
         double[] x = {1, 2, 3, 4};