Update overlay test to issue_1439 and fix indentation

Author: kashish2710

test/algorithms/overlay/overlay.cpp

@@ -369,12 +369,9 @@ void test_all()
     // TEST_DIFFERENCE_B(issue_893_multi, 97213916.0, 1, 1); // needs is_traverse
 
 
-    #ifdef BOOST_GEOMETRY_TEST_ENABLE_FAILING
-    // Issue 1439
-// Regression test: intersection of non-overlapping polygons should be empty.
-   TEST_INTERSECTION(case_1439, 0, 0, 0.0);
-   #endif
-
+#ifdef BOOST_GEOMETRY_TEST_ENABLE_FAILING
+    TEST_INTERSECTION(issue_1439, 0, 0, 0.0);
+#endif
 
     TEST_UNION(case_134_multi, 66.0, 1, 2);
     TEST_UNION(case_76_multi, 8.0, 5, 0);