Bug 32969: (follow-up) Remove obsolete inline CSS

Bug 32969: (follow-up) Remove obsolete inline CSS

A couple of templates have some inline CSS intended to style jQueryUI
tabs. These instances can be removed:

- opac-readingrecord.tt: Tabs have been replaced with Bootstrap.
- opac-idref.tt: There doens't appear to be any tab-related markup in
  the template at all.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 82859c8568d86c2c9e443d9731b68646b5d20332)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>