Bug 1893552 - Fix diffoscope firefox/update-settings.ini differs. r=firefox-build-system-reviewers,ahochheiden

This was oversight: the line was replaced in
https://hg.mozilla.org/mozilla-central/rev/ceddfae53011fce1e8684c43c7bffb427bbd320b
and the replacement made macOS-specific in
https://hg.mozilla.org/mozilla-central/rev/6042c255bc4097b4722c1f896c07f7a50fe3b8ed.
This restores the non-macOS line.

Differential Revision: https://phabricator.services.mozilla.com/D208805

taskcluster/kinds/diffoscope/artifacts.yml

@@ -17,6 +17,8 @@ job-defaults:
         # bug 1825141 - telemetry.fog.artifact_build isn't stable between
         # artifact and not-artifact builds, so remove its line if present.
         - sed -i '/telemetry\.fog\.artifact\_build/d' b/"$RESOURCE_DIR"/browser/defaults/preferences/firefox.js
+        # non-macOS artifact builds are not fed with accepted-mar-channel-ids.
+        - if [ -f a/"$RESOURCE_DIR"/update-settings.ini ]; then sed -i '/ACCEPTED_MAR_CHANNEL_IDS/d' {a,b}/"$RESOURCE_DIR"/update-settings.ini; fi
         # macOS artifact builds have local update configurations, not Nightly
         # update configurations.
         - rm -f {a,b}/"$RESOURCE_DIR"/../Frameworks/ChannelPrefs.framework/ChannelPrefs