use strings for map json coord_event var_value

data/maps/VictoryRoad_1F/map.json

@@ -176,7 +176,7 @@
       "y": 23,
       "elevation": 4,
       "var": "VAR_0x40C3",
-      "var_value": 0,
+      "var_value": "0",
       "script": "VictoryRoad_1F_EventScript_235DAF"
     },
     {
@@ -185,7 +185,7 @@
       "y": 23,
       "elevation": 4,
       "var": "VAR_0x40C3",
-      "var_value": 0,
+      "var_value": "0",
       "script": "VictoryRoad_1F_EventScript_235DC8"
     }
   ],