Updated save sequence for settings group in admin-x

refs https://github.com/TryGhost/Team/issues/3151

- updated save sequence for setting groups where edit button is hidden by default
- shows `Saved` for couple of seconds before disappearing on saving such setting groups
- adds save sequence for default recipient setting group

ghost/admin-x-settings/src/admin-x-ds/settings/SettingGroup.tsx

@@ -93,6 +93,15 @@ const SettingGroup: React.FC<SettingGroupProps> = ({
                 onClick: handleEdit
             }
         );
+    } else if (saveState === 'saved') {
+        viewButtons.push(
+            {
+                label: 'Saved',
+                key: 'edit',
+                color: 'green',
+                onClick: handleEdit
+            }
+        );
     }
 
     let editButtons: IButton[] = [

ghost/admin-x-settings/src/components/settings/email/DefaultRecipients.tsx

@@ -49,6 +49,7 @@ function getDefaultRecipientValue({
 const DefaultRecipients: React.FC = () => {
     const {
         currentState,
+        saveState,
         handleSave,
         handleCancel,
         updateSetting,
@@ -115,6 +116,7 @@ const DefaultRecipients: React.FC = () => {
     return (
         <SettingGroup
             description='When you publish new content, who do you usually want to send it to?'
+            saveState={saveState}
             state={currentState}
             title='Default recipients'
             onCancel={handleCancel}