Bug 1673007 - Undef WMFAudioMFTManager's LOG macro at end of file. r=alwu

This stops the log leaking into other files during the unified build this is
desirable to avoid
- Other files relying on this log macro and then breaking when unified build
  boundaries shift.
- Other files getting this LOG definition unexpectedly and logging incorrectly
  and/or emitting warnings due to macro redefinitions.

Differential Revision: https://phabricator.services.mozilla.com/D94743

dom/media/platforms/wmf/WMFAudioMFTManager.cpp

@@ -312,3 +312,5 @@ WMFAudioMFTManager::Output(int64_t aStreamOffset, RefPtr<MediaData>& aOutData) {
 void WMFAudioMFTManager::Shutdown() { mDecoder = nullptr; }
 
 }  // namespace mozilla
+
+#undef LOG