Fix incorrect message when private key given

[so-schen]

Description

Type of Change

• [ ] New feature
• [x] Bug fix
• [ ] Breaking change
• [ ] Performance improvement
• [ ] Refactoring
• [ ] Dependency update
• [ ] Documentation update
• [ ] Tests

Which Components or Systems Does This Change Impact?

• [ ] Validator Node
• [ ] Full Node (API, Indexer, etc.)
• [ ] Move/Aptos Virtual Machine
• [ ] Aptos Framework
• [x] Aptos CLI/SDK
• [ ] Developer Infrastructure
• [ ] Other (specify)

How Has This Been Tested?

Key Areas to Review

Checklist

• [x] I have read and followed the CONTRIBUTING doc
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I identified and added all stakeholders and component owners affected by this change as reviewers
• [ ] I tested both happy and unhappy path of the functionality
• [ ] I have made corresponding changes to the documentation

[trunk-io[bot]]

⏱️ 40m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
rust-unit-tests	24m	🟩
run-tests-main-branch	6m	🟩
rust-lints	5m	🟥
general-lints	2m	🟩
check-dynamic-deps	2m	🟩
semgrep/ci	27s	🟩
file_change_determinator	16s	🟩
file_change_determinator	13s	🟩
file_change_determinator	12s	🟩
permission-check	9s	🟥 🟩
permission-check	7s	🟥 🟩
permission-check	7s	🟥 🟩
permission-check	6s	🟥 🟩
rust-move-tests	3s	🟩

🚨 2 jobs on the last run were significantly faster/slower than expected

Job	Duration	vs 7d avg	Delta
run-tests-main-branch	6m	4m
rust-move-tests	3s	2m

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[github-actions[bot]]

This issue is stale because it has been open 45 days with no activity. Remove the stale label, comment or push a commit - otherwise this will be closed in 15 days.