moving with_model rspec configuration into Active Record model adapter spec

spec/cancan/model_adapters/active_record_adapter_spec.rb

@@ -1,6 +1,10 @@
 if ENV["MODEL_ADAPTER"].nil? || ENV["MODEL_ADAPTER"] == "active_record"
   require "spec_helper"
 
+  RSpec.configure do |config|
+    config.extend WithModel
+  end
+
   ActiveRecord::Base.establish_connection(:adapter => "sqlite3", :database => ":memory:")
 
   describe CanCan::ModelAdapters::ActiveRecordAdapter do

spec/spec_helper.rb

@@ -14,7 +14,6 @@ RSpec.configure do |config|
     Project.delete_all
     Category.delete_all
   end
-  config.extend WithModel if defined? WithModel
 end
 
 class Ability