qt: do not use access for resource or local images

Access was meant to be used for remote images as we stopped using Qt Network, Qt can not retrieve remote images.

QQuickImage can handle local or resource files better for its needs. It does not need to use an image provider for local files.

VLCAccessImage is not good when same images loaded together. When I add an album to the playlist, even though the items share the same image (url), they appear to be loaded multiple times. I assume this has something to do with VLCAccessImage being an asynchronous provider.

With the default behavior, as long as cache is enabled, the images are re-used when possible.

Request review @chub.