Refactor specs to match new directory structure

spec/controllers/chat_controller_spec.rb

@@ -1,5 +1,5 @@
 require 'rails_helper'
-require_relative './dummy_provider'
+require_relative '../dummy_provider'
 
 describe 'Chat Controller', type: :request do
   let(:first_post) { Fabricate(:post) }

spec/services/manager_spec.rb

@@ -1,6 +1,6 @@
 require 'rails_helper'
 require_dependency 'post_creator'
-require_relative '../../dummy_provider'
+require_relative '../dummy_provider'
 
 RSpec.describe DiscourseChat::Manager do