qt: fix artist view regressions
See individual commits.
- Initial selection should not be the first item. Views should not have a selection initially. This seems to be an old bug, now it is exposed.
- Clicking a delegate does not change the current index.
- Functioning of double clicking list view delegate is broken due to "Error: Insufficient arguments".
Regressions since !6687 (merged).
Request review @chub.