current: only register current with start_time if find only one electric current

nxtomomill/converter/hdf5/acquisition/standardacquisition.py

@@ -537,9 +537,6 @@ class StandardAcquisition(BaseAcquisition):
                 new_know_electric_currents[
                     str_datetime_to_numpy_datetime64(start_time)
                 ] = (electric_currents[0] * unit_factor)
-                new_know_electric_currents[
-                    str_datetime_to_numpy_datetime64(end_time)
-                ] = (electric_currents[0] * unit_factor)
             else:
                 # linspace from datetime within ms precision.
                 # see https://localcoder.org/creating-numpy-linspace-out-of-datetime#credit_4