Bug 1447982 - Cover channel count changes also when mic source is stopped (muted). r=padenot

MozReview-Commit-ID: HtDS5SXL08

--HG--
extra : rebase_source : bd815cffb2705fcb1da817b10daeb738405e76dd

dom/media/webrtc/MediaEngineWebRTCAudio.cpp

@@ -466,6 +466,7 @@ MediaEngineWebRTCMicrophoneSource::UpdateSingleSource(
       break;
 
     case kStarted:
+    case kStopped:
       if (prefs == mLastPrefs) {
         return NS_OK;
       }