other: add schema test for uncommented default config

[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:

Add a test for an uncommented variant of the default config file.

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

Attention: Patch coverage is 51.69492% with 57 lines in your changes missing coverage. Please review.

Project coverage is 40.84%. Comparing base (7666a09) to head (068fa73).

Files	Patch %	Lines
src/main.rs	3.33%	29 Missing ⚠️
src/options/config/process.rs	70.58%	25 Missing ⚠️
src/options.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1484      +/-   ##
==========================================
+ Coverage   40.83%   40.84%   +0.01%     
==========================================
  Files         102      102              
  Lines       17547    17620      +73     
==========================================
+ Hits         7165     7197      +32     
- Misses      10382    10423      +41     

Flag	Coverage Δ
macos-12	36.21% <51.69%> (+0.02%)	⬆️
ubuntu-latest	42.79% <51.69%> (+<0.01%)	⬆️
windows-2019	36.35% <51.69%> (+0.02%)	⬆️

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