chore: Update CLI prompt to run command as root

[banjoh]

Description, Motivation and Context

Minor fix to prompt printed for users to have them run support-bundle or preflight as root

Checklist

• [ ] New and existing tests pass locally with introduced changes.
• [ ] Tests for the changes have been added (for bug fixes / features)
• [x] The commit message(s) are informative and highlight any breaking changes
• [ ] Any documentation required has been added/updated. For changes to https://troubleshoot.sh/ create a PR here

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No