Fix mautrix-telegram registration file mistake

Regression since f6097fbba1

roles/matrix-bridge-mautrix-telegram/defaults/main.yml

@@ -118,7 +118,7 @@ matrix_mautrix_telegram_registration_yaml: |
         regex: '^#telegram_.+:{{ matrix_mautrix_telegram_homeserver_domain|regex_escape }}$'
   # See https://github.com/tulir/mautrix-signal/issues/43
   sender_localpart: _bot_{{ matrix_mautrix_telegram_appservice_bot_username }}
-  sender_localpart: telegrambot
+  url: {{ matrix_mautrix_telegram_appservice_address }}
   rate_limited: false
 
 matrix_mautrix_telegram_registration: "{{ matrix_mautrix_telegram_registration_yaml|from_yaml }}"