fix: remove invalid aria-label for panel (#2685)

Co-authored-by: Akshat Patel <[email protected]>

Author: andyl309

src/ui-shell/panel/panel.component.ts

@@ -23,5 +23,5 @@ export class Panel {
 	 */
 	@Input() expanded = false;
 
-	@Input() ariaLabel = "Header panel";
+	@Input() ariaLabel;
 }