Remove a few too early pledge(2)s on games/ and apply them a little bit later

Remove a few too early pledge(2)s on games/ and apply them a little bit later
but with much reduced permissions ("stdio tty" if ncurses based and "stdio"
for the ones that only perform basic operations).

There's still a few games that we cannot yet remove their fs access, through
pledge(2), since they open files on demand and too late, this might get
revisited in the future.

OK tb@