ISF_FastCaloSimEvent: replace MsgStreamMember with MsgStream
This MR reverts the changes to TFCSParametrizationBase
done in !53224 (merged) and replaces the use of MsgStreamMember
with a plain MsgStream
. This is obviously not thread-safe and would require further work. Using AthMessaging
is not an option in this case as
TFCSParametrizationBase
needs to be ROOT-storable.
Relates to ATLASSIM-5854.
Edited by Frank Winklmeier