Grav Admin login page doesn't obey force_ssl

[brendanpetty]

After enabling the force_ssl option in Grav system config, I've found it doesn't redirect the /admin page to a https connection. This is the most important page to have forced to redirect.
Either the admin plugin needs to obey Grav's system setting for this, or it needs its own setting to force https on the login (and refuse to accept a password if not https)

[brendanpetty]

Thanks!