Resolve "Ajout de la passe à rugosité de fond"

Closes #657 (closed)

src/app/calculators/rugofond/config.json

@@ -8,15 +8,21 @@
         ]
     },
     {
-        "id": "fs_geometry",
+        "id": "fs_geometry_crete",
         "type": "fieldset",
         "fields": [
             "L",
+            "CdT"
+        ]
+    },
+    {
+        "id": "fs_geometry_rampe",
+        "type": "fieldset",
+        "fields": [
             {
                 "id": "If",
                 "help": "hsl/pente.html"
             },
-            "CdT",
             "d65",
             "a"
         ]