Fix for mantis 2809: re-enable quick-start-missions (g key in debug)
Save Recent_missions & last_flown_ship_si_index to CSG

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9597 387891d4-d844-0410-90c0-e4c51a9137d3