db_init: removed duplicate code (#1727)

init-db-as-superuser.sql

@@ -18,19 +18,4 @@ ALTER DEFAULT PRIVILEGES
 
 
 CREATE ROLE windmill_admin WITH BYPASSRLS;
-
-GRANT ALL
-ON ALL TABLES IN SCHEMA public 
-TO windmill_admin;
-
-GRANT ALL PRIVILEGES 
-ON ALL SEQUENCES IN SCHEMA public 
-TO windmill_admin;
-
-ALTER DEFAULT PRIVILEGES 
-    IN SCHEMA public
-    GRANT ALL ON TABLES TO windmill_admin;
-
-ALTER DEFAULT PRIVILEGES 
-    IN SCHEMA public
-    GRANT ALL ON SEQUENCES TO windmill_admin;
+GRANT windmill_user TO windmill_admin;