Use actual flag values for hidden items

data/maps/SilphCo_5F/map.json

@@ -201,7 +201,7 @@
       "y": 16,
       "elevation": 0,
       "item": "ITEM_ELIXIR",
-      "flag": "HIDDEN_ITEM_SILPH_CO_5F_ELIXIR",
+      "flag": "FLAG_HIDDEN_ITEM_SILPH_CO_5F_ELIXIR",
       "quantity": 1,
       "underfoot": false
     },
@@ -331,7 +331,7 @@
       "y": 9,
       "elevation": 0,
       "item": "ITEM_PP_UP",
-      "flag": "HIDDEN_ITEM_SILPH_CO_5F_PP_UP",
+      "flag": "FLAG_HIDDEN_ITEM_SILPH_CO_5F_PP_UP",
       "quantity": 1,
       "underfoot": false
     },