metadata: Properly clean inetref when searching for collection

Also reduce duplicated code.
Remove code handling of title as inetref. The issue if it exists must be resolved elsewhere
metadata: Properly separate TV title/subtitle search from inetref/subtitle search

This prevent likely errors of parsing a title as an inetref, in particular if it contains a ‘:’
metadata: if video type not known, try both movie and television grabber

In case the type couldn’t be identified, it would assume it was only TV