Music source should not be saved in save file

[Loobinex]

Starting a campaign without the -nocd param will stop music from playing during the entire campaign. Exiting the game, and then enabling it before starting again does not enable the music. It should.

[AdamPlenty]

game.flags_cd are the other flags affected?

[Loobinex]

@AdamPlenty The other flags seem fine to be saved, they do not come from the command line.

[AdamPlenty]

Then perhaps we ought to move nocd out of the flags.

[Loobinex]

That might be a good solution.