Noticed this while working on WT-10075, and the patch is trivial so no point holding it up.

While running format.sh with the "-r" flag (for "record with UndoDB"), we set live_record_command="$live_record_command --save-on error", which after a few iterations, ends up running commands like format.sh: udb --save-on error --save-on error --save-on error --save-on error ... ./t