Fix small issue in Write File Record server response #98
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According to the official MODBUS protocol documentation the normal response of a Write File Record request is an echo of the request. The whole request including the records data must be included in the response. This pull request makes sure the whole request is send as a response.
Link to the MODBUS documentation for reference: https://www.modbus.org/docs/Modbus_Application_Protocol_V1_1b3.pdf