AudioDecoderConfig.numberOfChannels and AudioDecoderConfig.sampleRate should be explicitly forbidden to be 0

[jyavenard]

Similar to #860

Currently the specs only consider an AudioDecoderConfig as invalid if

1. If codec is empty after stripping leading and trailing ASCII whitespace, return false.
2. If description is [detached], return false.
3. Return true.

It should be:

1. If codec is empty after stripping leading and trailing ASCII whitespace, return false.
2. If description is [detached], return false.
3. If sampleRate or numberOfChannels are equal to zero, return false.
4. Return true.