Fix typo on directories to cleanup when deleting a system (bsc#1228101)

[meaksh]

What does this PR change?

This PR fixes a typo on the paths to some minion files to cleanup when deleting a system in Uyuni. This was noticed as the /etc/venv-salt-minion/pki/minion/minion_master.pub and some other files were not cleaned up properly during system deletion as it was expected.

GUI diff

No difference.

• DONE

Documentation

• No documentation needed: only internal and user invisible changes

• DONE

Test coverage

• No tests: no tests for this

• DONE

Links

Issue(s): https://github.com/SUSE/spacewalk/issues/24906
Port(s): https://github.com/SUSE/spacewalk/pull/24907

• DONE

Changelogs

Make sure the changelogs entries you are adding are compliant with https://github.com/uyuni-project/uyuni/wiki/Contributing#changelogs and https://github.com/uyuni-project/uyuni/wiki/Contributing#uyuni-projectuyuni-repository

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• Re-run test "backend_unittests_pgsql"
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• Re-run test "schema_migration_test_pgsql"
• Re-run test "susemanager_unittests"
• Re-run test "javascript_lint"
• Re-run test "spacecmd_unittests"

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[avshiliaev]

LGTM 🚀