Bug 37264: Fix delete button on staff interface's suggestion detail page

Bug 37264: Fix delete button on staff interface's suggestion detail page

This patch makes a few minor changes to the suggestion detail page in
the staff interface so that the "Delete" button looks correct and works
correctly.

To test, apply the patch and go to Suggestions in the staff interface.

- If necessary, submit a suggestion. You need at least one.
- From the suggestions management page, click the title of a suggestion.
- At the top of this page should be two buttons, "Edit" and "Delete."
  They should be styled consistently with each other.
- Clicking the "Delete" button should trigger a JavaScript confirmation
  dialog. Confirming should result in the suggestion being deleted.

Sponsored-by: Athens County Public Libraries
Signed-off-by: Phil Ringnalda <phil@chetcolibrary.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>