Re-add missing transaction around status-from-OStatus creation (#4603)

app/lib/ostatus/activity/creation.rb

@@ -16,11 +16,14 @@ class OStatus::Activity::Creation < OStatus::Activity::Base
 
     return [status, false] unless status.nil?
 
+    cached_reblog = reblog
+
+    ApplicationRecord.transaction do
       status = Status.create!(
         uri: id,
         url: url,
         account: @account,
-      reblog: reblog,
+        reblog: cached_reblog,
         text: content,
         spoiler_text: content_warning,
         created_at: published,
@@ -34,6 +37,7 @@ class OStatus::Activity::Creation < OStatus::Activity::Base
       save_mentions(status)
       save_hashtags(status)
       save_media(status)
+    end
 
     if thread? && status.thread.nil?
       Rails.logger.debug "Trying to attach #{status.id} (#{id}) to #{thread.first}"