Commit 593b3157b ("Fix systemd service Wants for mjolnir and draupnir")
accidentally swapped the variable loops: `systemd_wanted_services_list`
ended up generating `Requires=`/`After=` directives and
`systemd_required_services_list` ended up generating `Wants=` directives —
the opposite of what the variable names mean and how every other
bot/bridge service template in the playbook works.

This caused these bots to only `Wants=` (not `Requires=`/`After=`) their
dependencies like matrix-traefik.service, so systemd didn't guarantee
ordering. During all-at-once restarts, the bots would start before traefik
was ready, fail with DNS resolution errors, and crash.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>