LP#1662319: zindex Tweak in Patron Account

LP#1662319: zindex Tweak in Patron Account

The Other menu in a patron's account was dropping down behind the specify due
date input box. A tweak to the zindex for the Patron Account tabs was needed
for the menu to display in front of the input box.

Test plan:
Retrieve a patron in the web client. To the right of the Patron Account tabs,
click the Other dropdown menu. The menu will appear behind due date input.
Depending on the browser / screen resolution, it may also hide one of the
options in the dropdown menu. After the patch is loaded, the menu should display in front of the input as expected.

Signed-off-by: Kathy Lussier <klussier@masslnc.org>