Resolve "Ajout de la passe à rugosité de fond"

Closes #657 (closed)

src/app/calculators/rugofond/config.json

@@ -18,10 +18,7 @@
             },
             "CdT",
             "d65",
-            {
-                "id": "Ks",
-                "help": "pam/macrorugo.html#rugosite-de-fond"
-            }
+            "a"
         ]
     },
     {