LP 1126545 repair staff 'return to results' tpac link

Strip the extra "/" from the URL created by the "return to results"
button in the staff client TPAC view.  Havin the extra "/" in place
prevents the next/previous links from functioning.

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Jason Etheridge <jason@esilibrary.com>
Signed-off-by: Ben Shum <bshum@biblio.org>