`remotion`: Several buffering state fixes

[JonnyBurger]

Bugs we had before:

• Resume and buffering callbacks would fire twice
• In Studio, buffering indicator would only show once
• delay was set to 0 by default instead of 300 in the Studio
• Improper cleanup in listeners leading to unexpected behaviors

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
bugs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 10, 2024 8:21am
remotion	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 10, 2024 8:21am