Bug 16295: Fix access to MMT admin page

Bug 16295: Fix access to MMT admin page

There was a typo in the permission code

Test plan:
Try to access the marc modification templates admin page with the
marc_modification_templates permission (and not all tools permissions)

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit d046474805b065f7419fefb06902d6ae18a0cd29)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>