Fixed hidden popular page

How to reproduce:
 * Load `popular` page
 * Load any other category page
 * Return to `popular` page
Actual result:
 * Page is all black
Expected result:
 * Page is loaded with all popular movies

Fix:
Use views element to find children element instead of the global accessor. This way, we make sure $page will be a children of $el. Also, use the same id for all page element, this way it won't create multiple movie-list dependant of the source (cleaner DOM, less bug prone about leftover data).