Bug 16048 [Follow-up] Making notices actions buttons

 Bug 16048 [Follow-up] Making notices actions buttons

This followup adds a "td.actions" style with "white-space:nowrap" and
replaces the inline styles. Also modified is the way non-sorting table
columns are defined. This corrects a problem with non-sortable columns
introducted by the previous patch's column changes.

To test, apply the patch and clear your browser cache if necessary.

- Go to Tools -> Notices and confirm that even at narrow browser widths
  the "Edit" and "Delete" buttons stay side by side.
- Confirm that all columns are sortable except "Copy notice" and
  "Actions."

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>