coredump: remove duplicate MESSAGE= prefix from message
systemd-coredump[9982]: MESSAGE=Process 771 (systemd-journal) of user 0 dumped core. systemd-coredump[9982]: Coredump diverted to /var/lib/systemd/coredump/core... log_dispatch() calls log_dispatch_internal() which calls write_to_journal() which appends MESSAGE= on its own.
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