Move heal locations data to their associated map.json (#2034)

data/maps/VerdanturfTown/map.json

@@ -195,5 +195,12 @@
       "player_facing_dir": "BG_EVENT_PLAYER_FACING_ANY",
       "script": "VerdanturfTown_EventScript_RusturfTunnelSign"
     }
+  ],
+  "heal_locations": [
+    {
+      "id": "HEAL_LOCATION_VERDANTURF_TOWN",
+      "x": 16,
+      "y": 4
+    }
   ]
 }