Bug 21891: Remove non-XSLT detail view in the staff client

Bug 21891: Remove non-XSLT detail view in the staff client

This patch removes the non-XSLT markup from the bibliographic detail
page in the staff client. The XSLTDetailsDisplay preference has
been altered to accommodate this change. A blank value in
XSLTDetailsDisplay will now be equivalent to "default."

To test, apply the patch and set the value of XSLTDetailsDisplay to
either blank or "default."

View the detail page for a bibliographic record in the staff client. The
XSLT view should be shown.

Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>