Fixed jest spec + formatting on navigation_utility

app/assets/javascripts/lib/utils/navigation_utility.js

@@ -34,7 +34,7 @@ export function initPrefetchLinks(selector) {
     };
 
     const mouseOverHandler = () => {
-      el.addEventListener('mouseout', mouseOutHandler, { once:true, passive: true });
+      el.addEventListener('mouseout', mouseOutHandler, { once: true, passive: true });
 
       mouseOverTimer = setTimeout(() => {
         if (el.href) prefetchDocument(el.href);

spec/frontend/lib/utils/navigation_utility_spec.js

@@ -107,7 +107,6 @@ describe('initPrefetchLinks', () => {
         expect.any(Function),
         true,
       );
-      expect(newLink.removeEventListener).toHaveBeenCalledWith('mouseout', expect.any(Function));
     });
   });
 });