fix RECORD_AUDIO permission on Android when there is no permission

[agrapine]

Allows to record video without audio when we init the CameraController with enableAudio=false

 final controller = CameraController(
        camera.first,
        ResolutionPreset.high,
        enableAudio: false,
      );

[flutter-dashboard]

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[gemini-code-assist]

Code Review

This pull request aims to fix how audio recording is handled when permissions are missing or audio is disabled. While the intent is correct, the implementation contains a critical logical error that would mute audio when it should be enabled. Additionally, the corresponding unit tests have not been updated to reflect the new logic, which would cause them to fail. I've provided a detailed review comment on the withAudioEnabled method with a suggested fix and a reference to the testing guidelines.