login_form_(top|middle|bottom) should get $args

[aaroncampbell]

The login_form_* filters would be so much more useful if they got the $args array from wp_login_form(). For example, I'm wanting to add the ability to redirect the user on a failed login. I can hook into wp_login_failed but I'd like to be able to specify the failed location when I'm calling wp_login_form()

[scribu]

(In [16749]) Pass $args to login_form_* filters. Props aaroncampbell. Fixes #15702