fix wrong index in HandleStatePacket with flydigi controller #13819
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fix a wrong index checked with packet from flydigi controller.
Description
the operation packet from flydigi controller is started with 0x04 0xfe .

when handle it in function HandleStatePacket. used wrong index for check 0xfe. so when people use flydigi official application , the response ack started with 0x04 0xff will be recongized to operation wrong.