LP#1716486: fix hotkeys

LP#1716486: fix hotkeys

This fixes a regression on the hotkeys introduced by the offline
circulation module.

To test
-------
[1] Apply the patch and verify that hotkeys in the web staff client
    such as F1, F5, alt-s, and so forth work.
[2] Go to offline circulation and verify that select hotkeys such as
    F1 and F2 activate corresponding tabs in the offline circulation
    page.
[3] Repeat step 2 with the browser itself set to offline mode.

Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>