Bug 34478: Replace csrf_token input with include file

Bug 34478: Replace csrf_token input with include file

perl -p -i -n -e 's#<input type="hidden" name="csrf_token" value="\[% csrf_token \| html %]" />#[% INCLUDE '\''csrf-token.inc'\'' %]#g' **/*.tt **/*.inc

This should have actually been done at the same time as
  "Bug 30524: (QA follow-up) Only generate CSRF token if it will be used"

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>