mkosi conf opensuse: add systemd-journal-remote

* Add the missing package for mkosi opensuse conf, otherwise TEST-04-JOURNAL
  fails with "/usr/lib/systemd/systemd-journal-remote: No such file or
  directory"

Signed-off-by: val4oss <github.widget541@passmail.net>

mkosi/mkosi.conf.d/opensuse/mkosi.conf

@@ -21,6 +21,7 @@ VolatilePackages=
         systemd-doc
         systemd-experimental
         systemd-homed
+        systemd-journal-remote
         systemd-lang
         systemd-networkd
         systemd-portable