Bug 20515: Fix permission check on "ILL request" menu options

Bug 20515: Fix permission check on "ILL request" menu options

This patch adds the following additional conditions to the display of
both the ILL Requests drop down "More" menu option and the "ILL Requests"
option on the intranet front page:

Before:

[% IF Koha.Preference('ILLModule') %]

After:

[% IF Koha.Preference('ILLModule') && (CAN_user_ill || CAN_user_superlibrarian) %]

This prevents the options being displayed to users who have no
permissions to work with ILL.

Test plan:

View both the intranet front page and "More" dropdown while logged in as
a user without ILL permissions, ensure the options do not display. Then
do the same with a user with ILL permissions, ensure the options do
display.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>