Disabling backfilling does not work

[turbotorsten]

I have set backfilling to enable: false in the config, still the bridge starts backfilling every time the container is restarted.
If I remove all portals using delete-all-portals the bridge will create and backfill all of them on restart.

[tulir]

Creating portals can't be disabled currently, only message backfilling can be disabled.