fix debug-on-exit typo

Remi Le Trocquerrequested to merge
fix_debug_on_exit into main

The following change fix a small typo introduced in #2588

/home/gitlab-runner/builds/UBhEDAHVp/0/sylva-projects/sylva-core/tools/shell-lib/debug-on-exit.sh: line 164: k: command not found

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