Change: #621 登録時間帯制限で、制限時間中は登録を禁止ではなく承認制にする (#628)

* Change: #621 登録時間帯制限で、制限時間中は登録を禁止ではなく承認制にする

* 管理画面のUIを改善

* Fix test

* Fix lint

app/serializers/rest/instance_serializer.rb

@@ -111,7 +111,7 @@ class REST::InstanceSerializer < ActiveModel::Serializer
   def registrations
     {
       enabled: registrations_enabled?,
-      approval_required: Setting.registrations_mode == 'approved',
+      approval_required: Setting.registrations_mode == 'approved' || (Setting.registrations_mode == 'open' && !registrations_in_time?),
       limit_reached: Setting.registrations_mode != 'none' && reach_registrations_limit?,
       message: registrations_enabled? ? nil : registrations_message,
       url: ENV.fetch('SSO_ACCOUNT_SIGN_UP', nil),

app/serializers/rest/v1/instance_serializer.rb

@@ -115,7 +115,7 @@ class REST::V1::InstanceSerializer < ActiveModel::Serializer
   end
 
   def approval_required
-    Setting.registrations_mode == 'approved'
+    Setting.registrations_mode == 'approved' || (Setting.registrations_mode == 'open' && !registrations_in_time?)
   end
 
   def invites_enabled