Fix arguments being passed while authenticating

[stuarthayhurst]

Changes:

• If tui_root_login was used, not all arguments would be passed on during authentication, this is fixed by bringing it inline with the rest of the code

[vinceliuice]

It not working on dialog mode

[stuarthayhurst]

Alright, let me take a look at it, I'll try and fix it then make a new request

[stuarthayhurst]

I misinterpreted what the code was doing, with the old method it still fails when --custom-background is used, so I'll add a fix for it

[vinceliuice]

only add --${theme} --${icon} --${screen} is works well

[stuarthayhurst]

Yes, but if --boot or --custom-background are used, then these won't have any effect if the wasn't called with root and uses dialog mode

[stuarthayhurst]

Never mind, I misunderstood those code, again You can ignore what I said and leave it as is, I totally forgot dialog mode is only used if no arguments are given

[vinceliuice]

Yes! Dialog mode is used for only run ./install.sh