Fixed a FRED crash when using $Flight controls follow eyepoint orientation (patch by MageKing17).

git-svn-id: svn://svn.icculus.org/fs2open@11163 387891d4-d844-0410-90c0-e4c51a9137d3
Trunk sync r11163.

git-svn-id: svn://svn.icculus.org/fs2open@11164 387891d4-d844-0410-90c0-e4c51a9137d3