rustdoc: remove no-op CSS #crate-search-div { display: inline-block }

`#crate-search-div` is nested directly below `.search-results-title`, which
has `display: inline-flex`. This makes the crate-search-div a [flex item],
which makes its display property irrelevant, because flex items have their
display [blockified] in any case.

[flex item]: https://developer.mozilla.org/en-US/docs/Glossary/Flex_Item
[blockified]: https://www.w3.org/TR/css-flexbox-1/#flex-items

src/librustdoc/html/static/css/rustdoc.css

@@ -803,7 +803,6 @@ table,
 	align-items: baseline;
 }
 #crate-search-div {
-	display: inline-block;
 	/* ensures that 100% in properties of #crate-search-div:after
 	are relative to the size of this div */
 	position: relative;