Avoid lowercasing Destination field on one-ways (#829)

Author: 1ec5

data/fields/destination_oneway.json

@@ -6,5 +6,6 @@
         "key": "oneway",
         "value": "yes"
     },
-    "snake_case": false
+    "snake_case": false,
+    "caseSensitive": true
 }