Bug 16947: Can not modify patron messaging preferences

Bug 16947: Can not modify patron messaging preferences

To verify:
- Set syspref 'EnhancedMessagingPreferences' to 'Allow'
- In staff client, go to a patron's detail page
- Edit Patron messaging preferences (using link below table)
- Save
Result: Form does not save, stays open
JavaScript error in intranet-tmpl/prog/js/members.js line 107
TypeError: document.form.password is undefined

To test:
- Apply patch
- Repeat steps above
- Verify that messaging preferences save as expected
- Verify that other patron modifications work as before

NOTE: remember to force reload of the javascripts.

Signed-off-by: Mark Tompsett <mtompset@hotmail.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 87d96b973aa19e0808070d4b0fdd6485e5c83181)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>