Use OFFLINE_DATA_SEND_SUCCESS when all of a page is received.

[Brojowski]

If you try to handle OFFLINE_DATA_SEND_SUCCESS in onReceiveMessage(), it never gets called because PenMsgType.OFFLINE_DATA_SEND_SUCCESS is never used in CommProcessor20. However, the message OFFLINE_DATA_SEND_STATUS is sent where total_size == received_size.

This pull request checks to see if total_size == received_size and uses STATUS or SUCCESS accordingly.