Bug 28191: Upate wording on batch patron deletion

Bug 28191: Upate wording on batch patron deletion

This adds another point to the list of things that prevent patron
deletion:

<li>They have permissions assigned to them.</li>

In order to test:
- Go to tools > patron deletion and anonymization
- Verify the new condition shows at the top of the page.

Signed-off-by: Andrew Fuerste-Henry <andrew@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>