Fix email search redirect

Oh oops, I missed this path change when I changed the route to `/user/:id/lists`! This caused searching by email to redirect to the homepage, but with a valid URL in the address bar; and refreshing the page would hit the redirect defined in `vercel.json`, redirect to the new route, and load the correct page.

Fixed!

src/app/UserItemListsIndexPage.js

@@ -375,7 +375,7 @@ function UserSearchForm() {
           return;
         }
 
-        history.push(`/user/${user.id}/items`);
+        history.push(`/user/${user.id}/lists`);
       },
       onError: (error) => {
         console.error(error);