bug: fix -V not working and causing Cirrus CI to fail

[ClementTsang]

Description

A description of the change, what it does, and why it was made. If relevant (such as any change that modifies the UI), please provide screenshots of the changes:

I used the wrong flag casing (-V vs -v) which broke Cirrus CI, which expected to run btm -V as a sanity check.

This fixes it and adds a test to catch it in the future.

Issue

If applicable, what issue does this address?

Closes: #

Testing

If relevant, please state how this was tested. All changes must be tested to work:

If this is a code change, please also indicate which platforms were tested:

• Windows
• macOS
• Linux

Checklist

If relevant, ensure the following have been met:

• Areas your change affects have been linted using rustfmt (cargo fmt)
• The change has been tested and doesn't appear to cause any unintended breakage
• Documentation has been added/updated if needed (README.md, help menu, doc pages, etc.)
• The pull request passes the provided CI pipeline
• There are no merge conflicts
• If relevant, new tests were added (don't worry too much about coverage)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.74%. Comparing base (ee2e1fe) to head (e91a0f2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1478      +/-   ##
==========================================
+ Coverage   40.94%   41.74%   +0.80%     
==========================================
  Files          99       96       -3     
  Lines       17462    17112     -350     
==========================================
- Hits         7149     7143       -6     
+ Misses      10313     9969     -344     

Flag	Coverage Δ
macos-12	36.32% <ø> (ø)
ubuntu-latest	42.90% <ø> (+0.01%)	⬆️
windows-2019	?

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