Remove intial permissions seting

Permissions, when set in the template, will be augmented rahter than replaced when using matrix_mautrix_signal_configuration_extension_yaml. Therefore, permissions shall only be set in the defaults/vars.yml or in the HS specific vars.yml file

roles/matrix-bridge-mautrix-signal/templates/config.yaml.j2

@@ -188,8 +188,10 @@ bridge:
     #        * - All Matrix users
     #   domain - All users on that homeserver
     #     mxid - Specific user
-    permissions: 
-        {{ matrix_mautrix_signal_homeserver_domain }}: user
+    #permissions: 
+    #
+    # Remark: permissions will be set in the defaults/main.yml file of this role 
+    # (see matrix_mautrix_signal_configuration_extension_yaml)
 
     relay:
         # Whether or not relay mode should be allowed. If allowed, `!signal set-relay` can be used to turn any