Update hidden item json fields

data/maps/Route9/map.json

@@ -198,7 +198,8 @@
       "elevation": 0,
       "item": "ITEM_ETHER",
       "flag": "HIDDEN_ITEM_ROUTE9_ETHER",
-      "unknown": 1
+      "quantity": 1,
+      "underfoot": false
     },
     {
       "type": "hidden_item",
@@ -207,7 +208,8 @@
       "elevation": 3,
       "item": "ITEM_RARE_CANDY",
       "flag": "HIDDEN_ITEM_ROUTE9_RARE_CANDY",
-      "unknown": 1
+      "quantity": 1,
+      "underfoot": false
     },
     {
       "type": "hidden_item",
@@ -216,7 +218,8 @@
       "elevation": 3,
       "item": "ITEM_CHESTO_BERRY",
       "flag": "HIDDEN_ITEM_ROUTE9_CHESTO_BERRY",
-      "unknown": 1
+      "quantity": 1,
+      "underfoot": false
     }
   ]
 }