Fixed the submodel LOD finding code to work even when the a,b,c,... letters are in the middle of the name.

git-svn-id: svn://svn.icculus.org/fs2open/branches/zookeeper@9827 387891d4-d844-0410-90c0-e4c51a9137d3
Trunk sync r9824.

git-svn-id: svn://svn.icculus.org/fs2open/branches/zookeeper@9828 387891d4-d844-0410-90c0-e4c51a9137d3