Fix on signal key press event for non us qwerty layouts

# Description - Please include a summary of the change. Fixes #https://github.com/atlas-engineer/nyxt/issues/3677 # Checklist: - [ ] Git branch state is mergable. - [ ] Changelog is up to date (via a separate commit). - [ ] New dependencies are accounted for. - [ ] Documentation is up to date. - [ ] Compilation and tests (`(asdf:test-system :nyxt/<renderer>)`) - No new compilation warnings. - Tests are sufficient.