rustdoc-search: remove animated throbber

Complaints about it being distracting, and causing people to wait
until all of the results are loaded instead of using the incremental
results as they come in, make me think this is a bad idea.

Author: notriddle

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

@@ -1987,12 +1987,10 @@ a.tooltip:hover::after {
 	color: inherit;
 }
 #search-tabs button:not(.selected) {
-	--search-tab-button-background: var(--search-tab-button-not-selected-background);
 	background-color: var(--search-tab-button-not-selected-background);
 	border-top-color: var(--search-tab-button-not-selected-border-top-color);
 }
 #search-tabs button:hover, #search-tabs button.selected {
-	--search-tab-button-background: var(--search-tab-button-selected-background);
 	background-color: var(--search-tab-button-selected-background);
 	border-top-color: var(--search-tab-button-selected-border-top-color);
 }
@@ -2008,68 +2006,6 @@ a.tooltip:hover::after {
 	color: transparent;
 }
 
-.search-form.loading {
-	--search-tab-button-background: var(--button-background-color);
-}
-
-#search-tabs .count.loading::before,
-.search-form.loading::before
-{
-	width: 16px;
-	height: 16px;
-	border-radius: 16px;
-	background: radial-gradient(
-		var(--search-tab-button-background) 0 50%,
-		transparent 50% 100%
-	), conic-gradient(
-		var(--code-highlight-kw-color) 0deg 30deg,
-		var(--code-highlight-prelude-color) 30deg 60deg,
-		var(--code-highlight-number-color) 90deg 120deg,
-		var(--code-highlight-lifetime-color ) 120deg 150deg,
-		var(--code-highlight-comment-color) 150deg 180deg,
-		var(--code-highlight-self-color) 180deg 210deg,
-		var(--code-highlight-attribute-color) 210deg 240deg,
-		var(--code-highlight-literal-color) 210deg 240deg,
-		var(--code-highlight-macro-color) 240deg 270deg,
-		var(--code-highlight-question-mark-color) 270deg 300deg,
-		var(--code-highlight-prelude-val-color) 300deg 330deg,
-		var(--code-highlight-doc-comment-color) 330deg 360deg
-	);
-	content: "";
-	position: absolute;
-	left: 2px;
-	top: 2px;
-	animation: rotating 1.25s linear infinite;
-}
-#search-tabs .count.loading::after,
-.search-form.loading::after
-{
-	width: 18px;
-	height: 18px;
-	border-radius: 18px;
-	background: conic-gradient(
-		var(--search-tab-button-background) 0deg 180deg,
-		transparent 270deg 360deg
-	);
-	content: "";
-	position: absolute;
-	left: 1px;
-	top: 1px;
-	animation: rotating 0.66s linear infinite;
-}
-
-.search-form.loading::before {
-	left: auto;
-	right: 9px;
-	top: 8px;
-}
-
-.search-form.loading::after {
-	left: auto;
-	right: 8px;
-	top: 8px;
-}
-
 #search .error code {
 	border-radius: 3px;
 	background-color: var(--search-error-code-background-color);