Fix Mantis 2862: Crash exiting game from command briefing on newly created pilot, caused by double free in cutscenes.cpp

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9672 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Mantis 2859: Game crashes if mod is changed with the same pilot in use. From niffiwan.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@9673 387891d4-d844-0410-90c0-e4c51a9137d3