Associate RS authorizations with web apps

spec/factories/remote_storage_authorizations.rb

@@ -4,6 +4,7 @@ FactoryBot.define do
     client_id { "some-fancy-app" }
     redirect_uri { "https://example.com/some-fancy-app" }
     app_name { "Fancy App" }
-    expire_at { nil }
+    expire_at { 1.month.from_now }
+    web_app
   end
 end