Some small amendments to the 6-channel AAC GUI code:

Some small amendments to the 6-channel AAC GUI code:

- selecting a non-exportable setting (a non-5.1 track, or a non-AAC codec) now unchecks fAudLang1SurroundCheck as well as disabling it

- selecting the iPod video setting "MP4 file, AVC/H.264 Video, x264 (h.264 iPod)" will uncheck fAudLang1SurroundCheck, in a similar way to the way it turns off anamorphic

- fixed a small bug in the code that checks for when the iPod video setting is selected, to ensure it checks all three popups (previously the codecs popup wasn't being checked, meaning that selecting "MP4 file, MPEG-3 Video, XviD" would also turn off anamorphic)

git-svn-id: svn://svn.handbrake.fr/HandBrake/branches/0.8.0_beta2_5.1@322 b64f7644-9d1e-0410-96f1-a4d463321fa5