Fix: panics if AudioContextOptions#sinkId is invalid
          #545
        
          
      
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cf. https://webaudio.github.io/web-audio-api/#validating-sink-identifier - step 4.
It's indeed a little change in the API but that is the spec and the behaviour that is actually documented.
I guess it's ok as it doesn't break builds, but only raise a clippy warning eventually?