Standardize EVENT_OBJECT to OBJECT_EVENT

data/maps/SafariZone_Northwest/map.json

@@ -26,7 +26,7 @@
   ],
   "object_events": [
     {
-      "graphics_id": "EVENT_OBJ_GFX_MAN_1",
+      "graphics_id": "OBJ_EVENT_GFX_MAN_1",
       "x": 8,
       "y": 8,
       "elevation": 5,
@@ -39,7 +39,7 @@
       "flag": "0"
     },
     {
-      "graphics_id": "EVENT_OBJ_GFX_ITEM_BALL",
+      "graphics_id": "OBJ_EVENT_GFX_ITEM_BALL",
       "x": 33,
       "y": 7,
       "elevation": 3,