Update time unit in loss output file of some elements

From a discussion on MR !477 (merged), and in agreement with #357, the unit of time should be unified to s in some elements to avoid inconsistencies in the LossDataSink output file.

changed milestone to %OPAL 2021.1

added Enhancement label

marked this issue as related to #357

created merge request !479 (merged) to address this issue

mentioned in merge request !479 (merged)

closed via merge request !479 (merged)

mentioned in commit 78e2043f