LP#1680142: Fix responsive design issue with ebook display

LP#1680142: Fix responsive design issue with ebook display

Fixes the following responsive design issues:
* Removes the e-book dashboard display when the screen size is reduced.
* Changes the table display for e-items currently checked out, e-items on hold,
and e-iterms ready for checkout interfaces to mimic the responsive behavior of
other My Account screens.
* Fixes a couple of Holds History CSS problems discovered while I was here.

Test Plan:
Enable ebook services. Log into your account and resize the screen to the size
of a mobile device. The ebook dashboard will display while the main account
dashboard disappears. Go into My Account, click Items checked out and then
click E-Items Currently Checked Out. The table has not reformatted itself for
responsive design view.

Post-patch: When you log in and resize the screen, the e-items dashboard
display will disappear along with the main account dashboard. When you access
the E-Items Currently Checked Out interface, the table will reformat itself
with column headers along the left side.

Signed-off-by: Kathy Lussier <klussier@masslnc.org>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>
Conflicts:
	Open-ILS/src/templates/opac/css/style.css.tt2

Signed-off-by: Ben Shum <ben@evergreener.net>