rustdoc: remove unused CSS #search { position: relative }

This was added in 611d0e6, to allow its
child `#results` element to be absolutely positioned inside it. The
child stopped being absolute in 8c04695.

To keep the layout looking the same, the links need to not have
`width: 100%` any more, relying instead on the box naturally growing to
fit because it has `display: block`.

Author: notriddle

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

@@ -596,10 +596,6 @@ h2.location a {
 	margin: 0;
 }
 
-#search {
-	position: relative;
-}
-
 .search-loading {
 	text-align: center;
 }
@@ -977,7 +973,6 @@ so that we can apply CSS-filters to change the arrow color in themes */
 
 .search-results > a {
 	display: block;
-	width: 100%;
 	/* A little margin ensures the browser's outlining of focused links has room to display. */
 	margin-left: 2px;
 	margin-right: 2px;