Remove double puppet syncing option

example-config.yaml

@@ -56,8 +56,7 @@ appservice:
 
     # Whether or not to receive ephemeral events via appservice transactions.
     # Requires MSC2409 support (i.e. Synapse 1.22+).
-    # You should disable bridge -> sync_with_custom_puppets when this is enabled.
-    ephemeral_events: false
+    ephemeral_events: true
 
     # Authentication tokens for AS <-> HS communication. Autogenerated; do not modify.
     as_token: "This value is generated when generating the registration"
@@ -89,8 +88,6 @@ bridge:
     # Should the bridge use space-restricted join rules instead of invite-only for guild rooms?
     # This can avoid unnecessary invite events in guild rooms when members are synced in.
     restricted_rooms: true
-    # Should the bridge sync with double puppeting to receive EDUs that aren't normally sent to appservices.
-    sync_with_custom_puppets: true
     # Should the bridge update the m.direct account data event when double puppeting is enabled.
     # Note that updating the m.direct event is not atomic (except with mautrix-asmux)
     # and is therefore prone to race conditions.