Bug 12513 - PROG/CCSR deprecation: Remove OpacShowLibrariesPulldownMobile system...

Bug 12513 - PROG/CCSR deprecation: Remove OpacShowLibrariesPulldownMobile system preference

With CCSR having been deprecated there is no longer a use for the
OpacShowLibrariesPulldownMobile system preference. This patch removes
it.

To test, apply the patch and run updatedatabase. Check that the
preference can no longer be found in system preferences.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Preference removed, no koha-qa errors.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>