fix: favorite and remove from search history icon no-repeat in docsearch.css

[jguddas]

When the browser text size is not set to 16px some docsearch icons break.

Before: The remove from search and add search to favorites icon is tilled and repeated

After: The remove from search and add search to favorites icon is centererd and not tilled anymore.

[!NOTE] You can change the font size setting in chrome in the apperance settings. https://support.google.com/chrome/answer/96810#fontsize

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Name	Status	Preview	Comments	Updated (UTC)
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[adamwathan]

Thanks!