wip api [nfc]: Cut allow_nobody_group comments on permission settings; TODO this might be clearer after we do use the newly-declared-stable API on new servers

Rereading the API doc, this field is relevant only for controlling
a settings UI.  We probably will build settings UI for at least some
of these settings in the future; but naturally we'll only expose that
UI for servers that offer the respective settings, which means we can
rely on getting the data from the actual server rather than using a
fixture based on a particular other server version.

(And we can also expect to have already by then started

when we do, it'll be driven by
the actual values gotten from the server, so won't be needed in this
fixture

Author: gnprice

lib/api/model/initial_snapshot.dart

@@ -431,52 +431,42 @@ class SupportedPermissionSettings {
       // From the server's Stream.stream_permission_group_settings,
       // in zerver/models/streams.py.  Current as of f9dc13014, 2025-08.
       "can_add_subscribers_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: false,
           // default_group_name=SystemGroups.NOBODY,
       ),
       "can_administer_channel_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: false,
           // default_group_name="stream_creator_or_nobody",
       ),
       "can_delete_any_message_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: true,
           // default_group_name=SystemGroups.NOBODY,
       ),
       "can_delete_own_message_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: true,
           // default_group_name=SystemGroups.NOBODY,
       ),
       "can_move_messages_out_of_channel_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: true,
           // default_group_name=SystemGroups.NOBODY,
       ),
       "can_move_messages_within_channel_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: true,
           // default_group_name=SystemGroups.NOBODY,
       ),
       "can_remove_subscribers_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: true,
           // default_group_name=SystemGroups.ADMINISTRATORS,
       ),
       "can_send_message_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: true,
           // default_group_name=SystemGroups.EVERYONE,
       ),
       "can_subscribe_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: false,
           // default_group_name=SystemGroups.NOBODY,
       ),
       "can_resolve_topics_group": PermissionSettingsItem(
-          // allow_nobody_group=True,
           allowEveryoneGroup: true,
           // default_group_name=SystemGroups.NOBODY,
       ),