Fix lock upgrade issues in dev

[gdestuynder]

emailInputPlaceholder

The emailInputPlaceholder is no longer respected. This is a regression

Viorela writes

Ldap login form is asking for user name and password, instead of email and password. By that I understand that, for example, for [email protected] account the user name is vioia.

I tried to login using just 'vioia', but the login failed.

error argument

The error argument is lost with this.

Viorela writes : "error message for invalid ldap credentials is changed (probably to fit the change above?)"

LDAP Login Form Expanded By Default

I'm not sure the root cause of this bug

Viorela writes "​When navigating to login page of reps-dev.allizom.org (which has ldap and passwordless login types available), the ldap login form is expanded by default and it cannot be collapsed. ​Trying to login with ldap when passwordless form is expanded results in browser console error. See: https://vimeo.com/229272072"

Originally found in #141

[gdestuynder]

revert by #150 (ie this issue is no longer needed, though fixes would still be needed if we were to pull the commits back in)