manager: fix reloading in reload-or-restart --marked

manager: fix reloading in reload-or-restart --marked

bus_unit_queue_job_one has two callers:
- bus_unit_queue_job which would do the appropriate transormations
  to turn JOB_TRY_RESTART into JOB_TRY_RELOAD,
- and method_enqueue_marked_jobs which did not.
In effect, method_enqueue_marked_jobs() would queue restart jobs for
units which has Markers= needs-reload or needs-restart.

When the chunk of code which does the transformations is moved from
bus_unit_queue_job to bus_unit_queue_job_one, there is no change for
bus_unit_queue_job, and method_enqueue_marked_jobs is fixed.

The additional checks that are done seem reasonable to do from
method_enqueue_marked_jobs: we shouldn't be restarting units which are
configured to not allow that, or force unwanted start of dbus-broker.