fix: test rates naming

Author: garciasdos

tests/EngineTest.php

@@ -28,9 +28,9 @@
     // Not taxed
     'NT', 'NTX', 'NTM1',
     // Top scottish rates
-    'SD2', 'SD2X',
-    // Advanced scottish rates
     'SD3', 'SD3X',
+    // Advanced scottish rates
+    'SD2', 'SD2X',
     // Random tests
     'S 123 3 L',
 ]);