Bug 27860: Fix password recovery

Bug 27860: Fix password recovery

Same as the previous patch but for the password recovery feature.

Test plan:
1. Do not apply the patches
2. Set KohaAdminEmailAddress to an invalid email (root@localhost for
instance)
3. Use the password recovery feature
5. Boom (that must be fixed on a separate bug report)
6. Set KohaAdminEmailAddress to a valid email (root@example.org)
7. Use again the password recovery for a different user
8. Still Boom! (because it's processing the first invalid email)
9. Apply the patches, restart_all
10. Try again the password recovery
=> The email is sent!
Notice the change in DB, the first email is still there with status
"pending" and second email is sent!

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>