MusstConvDataCalc: do not compound name and destination name to create the channel name
@meyer @muzelle To be merged when this is merged in Bliss: bliss/bliss!2368 (merged)
Note: you could use f'{self.motor.name}_calc' instead of f'calc_{self.motor.name}' to be more consistent with f'{self.motor.name}_raw' but that would be an addtional change to the Nexus file @payno