Add the check for the setting of form candidate when saving form data

Add the check for the setting of form candidate when saving form data

[Title] Add the check for the setting of form candidate when saving form data
[Issue#] N/A
[Problem] form candidate is not working if autofill_password_form is disabled
[Cause] If autofill password is disabled, the form data is not saved
[Solution] Add the check for the setting of form candidate when saving form data

Change-Id: Id17ec873852104732ac447e2fdeaff6a4239df9f