More space in login message for line wrap

[f-bader]

The item #loginMessage only allows single line messages.
In German the is a line wrap and the text would float above the user text input.
Doubled the height so line wrap is possible

[bongiovimatthew-microsoft]

@f-bader, thank you for catching this. You're right that the line overflows on top of the text box when it's too long. I think instead of adjusting the height to be twice as tall, we should adjust the height to 'auto', which will maintain the narrow distance when the text is one line, but will push the text box below the message when the words wrap to a second line.

I have included the height to 'auto' fix in a separate pull request.