UX: suppress "in reply to" section in emails by default

UX: suppress “in reply to” section in emails by default

Previously we would include this section, unfortunately

  1. It is usually elided in gmail
  2. It can make the emails longer and more confusing
  3. Omission is a feature, it means people need to visit site to get context
diff --git a/config/site_settings.yml b/config/site_settings.yml
index 1c28fe7..98ddb57 100644
--- a/config/site_settings.yml
+++ b/config/site_settings.yml
@@ -2063,7 +2063,7 @@ user_preferences:
     enum: "PreviousRepliesSiteSetting"
     default: 2
-    default: true
+    default: false
     enum: "NewTopicDurationSiteSetting"

GitHub sha: 199a53e9