FIX: PM participants listed inline

spec/components/email/message_builder_spec.rb

@@ -247,17 +247,6 @@ describe Email::MessageBuilder do
 
   end
 
-  context "PM multiple participants" do
-    let(:pm_multiple) { Email::MessageBuilder.new(to_address,
-                                                               body: 'hello world',
-                                                               private_reply: true,
-                                                               participants: "user1, user2") }
-
-    it "lists participants out" do
-      expect(pm_multiple.body).to match('hello world\nuser1, user2')
-    end
-  end
-
   context "from field" do
 
     it "has the default from" do