Fix closed bug detection + various fixes

Baptiste Beauplatrequested to merge
lyknode/debexpo:fix/misc into live

This MR:

  • Fix the detection of closed bugs from status != open to status == closed. This allow closing of normal, forwarded, pending, fixed (but not closed) bugs
  • Fix celery commands where app argument was misplaced
  • Fix password reset confirm url for which the token format has changed in Django 3 (used from pip when developing debexpo)

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