Improve the contrast of the default `search_match_background` colors (#7382)

This PR improves the contrast of the default `search_match_background`
colors.

Release Notes:

- Improved the contrast of the default `search.match_background` colors.
8030e8cf47Marshall Bowers committed on 2/5/2024, 3:45:41 PM· committed by GitHubparent45429a4
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