Fixed pitch being doubled sometimes for mono sounds.

This is a more reliable fix than https://github.com/mono/MonoGame/pull/1940.
AudioFileStream.StreamBasicDescription (aka DataFormat) sometimes returns invalid properties BytesPerPacket, BytesPerFrame, ChannelsPerFrame. They are negative or zero. Mono sound is treated as stereo and its pitch become doubled.

Related bug: Failed to get buffer attributes error when playing sounds  https://bugzilla.xamarin.com/show_bug.cgi?id=11074
Related issue: https://github.com/mono/MonoGame/issues/1123

AVAudioPlayer can be used to get these properties reliably except AudioFileStream.DataByteCount.