tty role selection - 'random' default

tty role selection - 'random' default

Instead of just using 'random' as the default choice if the user hits
<return> when picking role, race, gender, or alignment, flag it as
pre-selected in the menu so that it can be seen to be the default.

Someday somebody is going to have to fix up the interaction between
PICK_ONE menu and pre-selected choice....