Use keyword arguments in tests

Raisl 5.1 removes support for non-keyword arguments in `#process`,
`#get`, `#post`, `#patch`, `#put`, `#delete`, and `#head` for the
`ActionDispatch::IntegrationTest` and `ActionController::TestCase`
classes. This means we have to add `params` everywhere in the controller
tests.

spec/controllers/organizations_controller_spec.rb

@@ -37,7 +37,7 @@ describe OrganizationsController do
 
   describe 'GET #conferences' do
     before :each do
-      get :conferences, id: organization.id
+      get :conferences, params: { id: organization.id }
     end
 
     it 'loads the organization' do