Bug 33095: Text is white on white when hovering over pay/writeoff buttons in paycollect

Bug 33095: Text is white on white when hovering over pay/writeoff buttons in paycollect

The "Make a payment" page uses unusual navigation for the switch between
the "Pay" and "Write off" views: Bootstrap nav pills. The style on these
is a little muddled because a mix of Bootstrap and custom CSS is at
work.

This patch adds some CSS specific to nav pills and removes some
ambiguous CSS. Two links in the template get a dummy "#" href attribute
to make them work better with default styles.

To test, apply the patch and rebuild the staff interface CSS.

 - Locate a patron who has outstanding charges (lost item charge,
   account renewal fee, overdue fine, etc.).
 - From the patron checkout or detail page, click the "Accounting" tab
   in the left hand sidebar.
 - Click the "Pay" button on one of the oustanding charges.
 - On the "Pay an individual fine" page, confirm that there is a button
   and a link at the top of tab panel: "Pay" and "Write off." The
   "Pay" button should green with white text, the "Write off" button
   should be white with green text.
 - Click the "Write off" button and the styles of the links should be
   reversed.
 - Confirm that the CSS changes do not affect the appearance of the main
   navigation bar at the top of the page.

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>