checkboxes: minor "feature" restore

[NightOwl]

When temporary excluding a file from syncing by unchecking the checkbox, the file disappears from the list (unless you make it visible again by clicking the appropriate view type button). I believe this automatic behaviour started a few versions ago. I think keep seeing the files you select/deselect with their checkboxes would be clearer and more user-friendly when selecting. Obviously, the option to hide the unchecked files afterwards is ok, but preferably not automatically. Just a thought, thanks for your time.