fix: missing parent section names in TOML

[Frederick888]

Description

The filters didn't have their parent section names, and were parsed as top-level items.

Issue

Filters not working.

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 53.92%. Comparing base (218d189) to head (5da011d).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1551       +/-   ##
===========================================
+ Coverage   41.20%   53.92%   +12.72%     
===========================================
  Files         113      113               
  Lines       17808    17808               
===========================================
+ Hits         7337     9603     +2266     
+ Misses      10471     8205     -2266     

Flag	Coverage Δ
macos-12	36.63% <ø> (ø)
ubuntu-latest	56.53% <ø> (+13.37%)	⬆️
windows-2019	36.79% <ø> (ø)

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[ClementTsang]

Oops, that's my bad. Thanks for fixing. Surprised the validation didn't catch that, I'll take a look at that later...

EDIT: #1552