Bug 31486: Redirect to proper page after message deletion

Bug 31486: Redirect to proper page after message deletion

To test:
1. Go to a patron account and create some messages
2. Try deleting some from both the patron details page and the patron checkout page.
3. Notice that is you are on the patron checkout page and delete a message you are then redirected to the patron details page.
4. Apply patch
5. Try deleting messages from both pages and confirm you are redirected back to that same page and the message is properly deleted.

Signed-off-by: Andrew Fuerste-Henry <andrewfh@dubcolib.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>