Fix a bug where the filter would only show available statuses and thus
make it impossible to disable a filter that's no longer available.
For example, when showing only `active` tasks, and no task is active any
more, it would remove the "filter circle" for `active` status, and thus
make it impossible to disable the filter. Now the filter will always
show all enabled statuses, even when there is no more job/task
with that status.
30a30f154b