Suggest get value of watchlist and favorites in viewDidLoad of SearchVC.

The default VC for the tab bar is ```SearchVC```. It would be better to get user's ```watchlist``` and ```favorites``` when loading ```SearchVC```. Because if not, ```WatchlistVC``` will not know whether a movie is in Favorites or not if user didn't open FavoritesVC yet (```toggleBarButton``` displayed as dark or not) and as same as ```FavoritesVC```.