Bug 1964810 - Enable fetch origins list from Remote Settings. r=media-playback-reviewers,padenot

Currently, we use the allowed list (blocked by default) on Release and
the blocked list (allowed by default) on other channels.

When switching to Remote Settings, we still want "blocked by default" on
Release and "allowed by default" on other channels. This patch makes Beta
"blocked by default" as well, to better test that behavior and help prevent
potential issues from reaching Release.

Differential Revision: https://phabricator.services.mozilla.com/D248171

modules/libpref/init/StaticPrefList.yaml

@@ -11707,10 +11707,10 @@
 # 4 : enabled blocked by default via Remote Settings
 -   name: media.eme.mfcdm.origin-filter.enabled
     type: RelaxedAtomicUint32
-#if defined(MOZ_DEV_EDITION) || defined(EARLY_BETA_OR_EARLIER)
-    value: 2
+#ifdef NIGHTLY_BUILD
+    value: 3
 #else
-    value: 1
+    value: 4
 #endif
     mirror: always