fix: preferences - added missing react key

[vojty]

Description

Warning: Each child in a list should have a unique "key" prop.

Check the render method of `PreferenceSections2`. See https://reactjs.org/link/warning-keys for more information.
    at PreferenceSections2 (http://localhost:3001/node_modules/.vite/deps/chunk-GD7R5KYS.js?v=01b8aa9b:17374:27)

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Fix [#1]()

[netlify]

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🔨 Latest commit	6b64cec

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@36c17ff). Click here to learn what that means.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #552   +/-   ##
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  Coverage        ?   35.95%           
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  Files           ?       70           
  Lines           ?     1196           
  Branches        ?      365           
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  Hits            ?      430           
  Misses          ?      766           
  Partials        ?        0           

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