Bug 28032: Button corrections in point of sale pages

Bug 28032: Button corrections in point of sale pages

This patch corrects some markup inconsistencies in some templates
related to point of sale:

- Point of sale -> Library details. The "btn-xs" class has been added to
  "Record cashup" and "Cashup all" buttons.
- Administration -> Debit types and Administration -> Credit types:
  - Font Awesome icons are removed from the "save" and "cancel" controls
    in order to keep them consistent with other templates.

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>