remove bad use of memcpy by assigning player class using an actual assign() method

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9831 387891d4-d844-0410-90c0-e4c51a9137d3
remove bad use of memcpy by assigning player class using an actual assign() method (part 2)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9832 387891d4-d844-0410-90c0-e4c51a9137d3