Keep only active entries in the Not Synced list #3171

Keep only active entries in the Not Synced list #3171

Now that we have a separate list for files that could not be synced,
we can make sure that it only shows entries for files that are still
not in sync with the server. This allows the user to treat this list
as action items in order to get everything synced, including the
blacklist.

Simply remove the keep-errors logic that was used when the lists were
merged to achieve this result.