Bug 17896: load BakerTaylor module with use

Bug 17896: load BakerTaylor module with use

We are incinsistent here, Amazon and Syndetics module are always loaeded in some places
BakerTaylor is conditional everywhere, and causes issues under plack

For simplicity sake I think we should just load this (small) module where it might be needed

To test:
1 - Disable Baker and Taylor images
2 - Restart plack
3 - Visit opac-readingrecord, opac-detail, opac-search, opac-shelves, opac-user
    Log in to opac
    Virew your reading history
    Make/view a list
    Search the catalog
    Look at an individual title
4 - Enable BakerTaylorEnabled
    If you don't have Baker and Taylor credentials, simply fudge them with bad data and enable
5 - Repeat steps above, in the word of Joubu "Kaboom"
6 - Apply patch
7 - Repeat 1-4
8 - You shoudl be able to load all the pages after enabling the pref

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>