audiounit_ios: set the mute_set callback from start

Fixes inconsistency with the "mute" variable state.

Will need a backport to 3.0.

changed milestone to %4.0

added Component::Audio: macOS / iOS / tvOS / visionOS label

added MRStatus::Reviewable label

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added MRStatus::Acceptable label and removed MRStatus::Reviewable label

added MRStatus::Accepted label and removed MRStatus::Acceptable label

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added 34 commits

• afbb1284...7e1e7902 - 33 commits from branch videolan:master
• 50eaa2ad - audiounit_ios: set the mute_set callback from start

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merged