Fix that AdminMailer does not send (#4012)

3a7106f0 · Yamagishi Kazutoshi · Eugen Rochko · 5c7a4f0b · 3a7106f0
--- a/app/mailers/admin_mailer.rb
+++ b/app/mailers/admin_mailer.rb
 # frozen_string_literal: true

 class AdminMailer < ApplicationMailer
+  helper StreamEntriesHelper
+
  def new_report(recipient, report)
    @report   = report
    @me       = recipient