Fix freeze_parameters in Compose and SpecCompose

[iver56]

When parameters are frozen in a Compose or SpecCompose:

• don't re-roll random number for p
• don't reshuffle transforms

[mmxgn]

Could you provide a little bit more info on that? What is the problem?

[iver56]

It randomizes "should_apply" (based on p), and it has the power to shuffle transforms, but it currently doesn't remember the value of "should_apply" and the shuffled order of transforms inside self.parameters. The idea is that calling freeze_parameters() will make it behave the same next time it gets called (so the same collection of transforms can be applied to another sound). This hasn't been properly implemented in Compose and SpecCompose yet