MSFT: 21032904 - Fix the property key type for PKEY_Music_Genre

[brbeec]

Why is this change being made?

I'm writing some new internal WME tests that found a few minor issues.

What changed?

• Fix the property key type for PKEY_Music_Genre
• Set MF_MT_COMPRESSED = true for uncompressed audio/video streams
  • This was supposed to already be set for uncompressed video by VideoEncodingProperties::CreateUncompressed(), however, it was getting overwritten and set to false by SampleProvider::SetEncodingProperties().
• Set MF_MT_ALL_SAMPLES_INDEPENDENT = false for uncompressed video streams
  • We don't need to explicitly set this for uncompressed audio streams since it's set by AudioEncodingProperties::CreatePcm().

How was the change tested?

I verified the new internal WME tests are passing now.