Bug 22621: Fix filters on subscription search results

Bug 22621: Fix filters on subscription search results

Caused by
  commit 4e698f7b478a094d7b32ebfeaa917bca05ebcc5b
  Bug 18426: Allow to edit subscriptions in batch

There is a shift caused by a hidden column, which make the filters
searching on the previous column.

Test plan:
- Add 1+ searchable additional field for subscription
- Create a new subscription
- Search for subscriptions
- Use the column filters to filter the results
=> The results must be filtered accordingly

Signed-off-by: Claire Gravely <claire.gravely@bsz-bw.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>