Bug 20023: Password recovery using email should be case insensitive

Bug 20023: Password recovery using email should be case insensitive

When entering an email to recover the password, a user should not have to know or remember the casing of the given email.

Test
0) enable OpacResetPassword
1) On the OPAC, click "Forgot your password"
2) Enter your email address as in your user account BUT WITH A DIFFERENT CASING
3) Submit.  This will fail.
4) Apply the patch, redo with success.

Signed-off-by: Michal Denar <black23@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit cc3bc2920744e35256b45b784c9788a64fe6dd04)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 0f019c89c18733c0e0220f41012a06c3b39df595)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>