Do not auto-add lightning bolt suffix to displayname for newly registered Conduit users

This makes it consistent with other homeserver implementations, which
do not mess with the displayname by adding suffixes.

roles/custom/matrix-conduit/defaults/main.yml

@@ -131,7 +131,7 @@ matrix_conduit_allow_registration: false
 matrix_conduit_allow_federation: true
 
 # Enable the display name lightning bolt on registration.
-matrix_conduit_enable_lightning_bolt: true
+matrix_conduit_enable_lightning_bolt: false
 
 matrix_conduit_trusted_servers:
  - "matrix.org"