[WebCodec | AudioEncoder] Test checks for "valid" samplingRate value, when none are defined as invalid

[jyavenard]

wpt/webcodecs/audio-encoder-config.https.any.js

Lines 167 to 180 in 1f7679a

	comment: 'Sample rate is too small',
	config: {
	codec: 'opus',
	sampleRate: 1,
	numberOfChannels: 2,
	},
	},
	{
	comment: 'Sample rate is too large',
	config: {
	codec: 'opus',
	sampleRate: 10000000,
	numberOfChannels: 2,
	},

The test checks that a sampling rate of 1 or 10000000 are invalid, and a whole series of validButUnsupportedConfigs

Why would a configuration be valid but unsupported. It should be normalised and either made it supported or not valid.

Firefox checks that the sampling rate is between 3000 and 384000 inclusive. That seems an acceptable choice