Fix #81117, show close icon in peek view

src/vs/editor/contrib/referenceSearch/media/peekViewWidget.css

@@ -56,10 +56,6 @@
 	margin: 0;
 }
 
-.monaco-editor .peekview-widget .head .peekview-actions .action-label.icon.close-peekview-action {
-	background: url('close-light.svg') center center no-repeat;
-}
-
 .monaco-editor .peekview-widget > .body {
 	border-top: 1px solid;
 	position: relative;
@@ -68,11 +64,6 @@
 /* Dark Theme */
 /* High Contrast Theme */
 
-.monaco-editor.hc-black .peekview-widget .head .peekview-actions .action-label.icon.close-peekview-action,
-.monaco-editor.vs-dark .peekview-widget .head .peekview-actions .action-label.icon.close-peekview-action {
-	background: url('close-dark.svg') center center no-repeat;
-}
-
 .monaco-editor .peekview-widget .peekview-actions .icon.chevron-up {
 	background: url('chevron-previous-light.svg') center center no-repeat;
 }
@@ -89,4 +80,4 @@
 .vs-dark .monaco-editor .peekview-widget .peekview-actions .icon.chevron-down,
 .hc-black .monaco-editor .peekview-widget .peekview-actions .icon.chevron-down {
 	background: url('chevron-next-dark.svg') center center no-repeat;
-}
+}

src/vs/editor/contrib/referenceSearch/peekViewWidget.ts

@@ -168,7 +168,7 @@ export abstract class PeekViewWidget extends ZoneWidget {
 		this._actionbarWidget = new ActionBar(actionsContainer, actionBarOptions);
 		this._disposables.add(this._actionbarWidget);
 
-		this._actionbarWidget.push(new Action('peekview.close', nls.localize('label.close', "Close"), 'close-peekview-action', true, () => {
+		this._actionbarWidget.push(new Action('peekview.close', nls.localize('label.close', "Close"), 'codicon-close', true, () => {
 			this.dispose();
 			return Promise.resolve();
 		}), { label: false, icon: true });