Revert "config: test without front haze"

This reverts commit bebfd64902.

config.js

@@ -594,7 +594,7 @@ window.CONFIG = {
             color: [0.58, 0.64, 0.72]
         },
         frontHaze: {
-            enabled: false,       // test: no front haze ring
+            enabled: true,        // stable front haze pass using terrain distance
             scaleHeightKm: 8.5,
             density: 0.22,
             gain: 1.0,