fix client bug

MapBox Extension/MapBoxLayer.cs

@@ -22,7 +22,13 @@ namespace Virgis {
         public override void OnNetworkSpawn() {
             base.OnNetworkSpawn();
             data.OnValueChanged += SetData;
+			if (IsServer)
+			{
 				data.Value = tmpdata;
+			} else
+			{
+				SetData(data.Value, data.Value);
+			}
         }
 
         public override void OnNetworkDespawn()