Fix typo in undercover.yml GitHub Action workflow

[grodowski]

Description

Fixes command typo and adds an untested patch to check the full feedback loop with Undercover.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

Screenshots & recording

Manual review steps

1. Step 1
2. Step 2

Manual reviewer: please leave a comment with output from the test if that's the case.

[codeclimate]

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[grodowski]

@adrianthedev tiny fix to unblock Undercover. The untested method should receive a check warning if everything works as expected.

[adrianthedev]

Thanks @grodowski

[adrianthedev]

I still see some errors @grodowski.
No hurry, but wanted to surface them out.