Not doing {% if matrix_admin %} checks in the YAML also fixes some issues
with indentation being incorrect sometimes.
This should be backward compatible, except for mautrix-signal's case
where `matrix_mautrix_signal_bridge_permissions` previously existed
as a string, not a dictionary. `tasks/validate_config.yml` will catch
the problem an even provide a quick fix.
"Community" support
- has been removed from mautrix/facebook in v0.3.3:
31cac6fb5e
- has been removed from mautrix/signal in v0.2.2:
1f27a608a6
- will be removed in the next mautrix/instagram release:
e2ae1ca503
- will be removed in the next mautrix/twitter release:
3893075265
