Bug 1662595 - Re-enable test_peerConnection_trackDisabling.html r=karlt

Differential Revision: https://phabricator.services.mozilla.com/D89072

dom/media/tests/mochitest/mochitest.ini

@@ -242,7 +242,6 @@ skip-if = (os == 'win' && processor == 'aarch64') # aarch64 due to bug 1537567
 scheme=http
 [test_peerConnection_trackDisabling_clones.html]
 [test_peerConnection_trackDisabling.html]
-disabled=bug 1660144
 skip-if = toolkit == 'android' # Bug 1614460
 [test_peerConnection_twoAudioStreams.html]
 [test_peerConnection_twoAudioTracksInOneStream.html]