Review 25403

C. Thomas Tyler
Removed journalPrefix as command line paramter during journal
rotation, deferring to db.config values, for Windows SDP.

Removed explicit specification of journalPrefix as a command line
argument to 'p4d -jj' command.  Specifying the prefix is redundant
as journalPrefix values are defined for the master server and
any/all replicas/edge servers in db.config, and db.config is the
One Source of Truth for journalPrefix.

#review @robert_cowham @mshields
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