Bug 13534: Do not remove tags on deleting a patron

Bug 13534: Do not remove tags on deleting a patron

On deleting a patron, all the tags approved by this user will be
deleted.
This can cause data lost.

Test plan:
0/ Do not execute the update DB entry
1/ Create 2 patrons A, B
2/ Create some tags with patron A logged in
3/ Approve them with patron B logged in
4/ Delete the 2 patrons
=> The tags have been deleted
5/ Execute the DB entry
6/ Repeat 1,2,3,4
=> The tags have not been deleted and are still shown on the interface
(result, detail, tags module)

Signed-off-by: Aleisha <aleishaamohia@hotmail.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com
(cherry picked from commit fb419ba83d8c7b6bf710b42ad3fe61701809fc0e)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>