[ResourceBundle] Fix template not found issue

[marek-pietrzak-tg]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Related tickets	fixes #4800
License	MIT

Fixes errors raised for a new resource with custom template path different than a default one (with colons, e.g. SyliusAdminBundle:Product).
Now the template is being found also under app/Resources/views directory.
I've noticed also a .html part was lost during one of the last commits in ResourceController. That's fixed as well.

All configurations should work now assuming correct twig files in place:

sylius_resource:
    resources:
        app.book:
            templates: book/Backend
            classes:
                model: AppBundle\Entity\Book
        app.artist:
            templates: AppBundle:artist
            classes:
                model: AppBundle\Entity\Artist
        app.author:
            classes:
                model: AppBundle\Entity\Author

[pjedrzejewski]

Awesome, thank you so much Marek! 👍