'O' for regexp options

'O' for regexp options

Noticed when testing tty menucolor changes recently, using the 'O'
command to interactively add a new entry would accept one and then
quit, unlike remove which accepts multiple at a time and then goes
back to the menu where you could choose 'remove' all over again.
Adding is still done one entry at a time, but instead of finishing,
it goes back to the menu where you can choose to add another.