* MM-26410 Allow moving channels into Favorites when they're favorited in prefs
* MM-26410 Fix management of Favorites category when updating preferences
* MM-26410 Add management of Favorites category when deleting preferences
* Address feedback 1
* Remove WHERE (1=1) from query
* Remove unnecessary sq.Expr
* Rewrite query to use left join
* Remove redundant where statement and add some more tests
* Fix linting issues
* Rename addChannelToFavoritesCategory to addChannelToFavoritesCategory