Bug 1598691 - Flip media.rdd-opus.enabled to true on Win. r=drno

Differential Revision: https://phabricator.services.mozilla.com/D54319

--HG--
extra : moz-landing-system : lando

modules/libpref/init/StaticPrefList.yaml

@@ -5836,7 +5836,7 @@
 #if defined(XP_LINUX) && !defined(ANDROID)
   value: true
 #elif defined(XP_WIN) && !defined(_ARM64_)
-  value: false
+  value: true
 #elif defined(XP_MACOSX)
   value: true
 #else