Fix wrong param name in scheduled statuses and return params in API (#9725)

The database column and API param are called in_reply_to_id, not
in_reply_to_status_id, so it makes no sense to encode it that way

app/serializers/rest/scheduled_status_serializer.rb

@@ -1,11 +1,15 @@
 # frozen_string_literal: true
 
 class REST::ScheduledStatusSerializer < ActiveModel::Serializer
-  attributes :id, :scheduled_at
+  attributes :id, :scheduled_at, :params
 
   has_many :media_attachments, serializer: REST::MediaAttachmentSerializer
 
   def id
     object.id.to_s
   end
+
+  def params
+    object.params.without(:application_id)
+  end
 end