Signup Screen fails on email verification required by logging in user.

[JulianSwales]

The response api for signup has been changed such that a user object is now returned so the check in the signup_screen fails when email verification is turned on.. Currently the code states if (response.data == null && response.user == null) however it should now be something like if (response.data == null && (response.user != null && response.user?.emailConfirmedAt == null))

Thanks, Julian