RCG: Remove time_shift offset 'correction' from duotone.
I'd mistakenly thought it was a good idea to correct duotone for "time_shift" parameters on ADCs, but that leads to a difference between reported duotone crossing time on the EPICS and the dutotone signal as reported by the DAQ.
This removes the offset. We'll have to correct the criteria for duotone errors instead.
Closes #523 (closed)