fix: do_grp_add_admins

schema/0301_grp_usr.sql

@@ -21,7 +21,7 @@ create function public.grp_add_members(to_grp int, add_usrs int[])
   as $$
 begin
   insert into public.grp_usr (grp, usr)
-  select grp, usr_id
+  select to_grp, usr_id
   from unnest(add_usrs) usr_id
   left join public.grp_usr gu on gu.usr = usr_id and gu.grp = to_grp
   where gu is null;