Fix: AWS SES Mailer (#365)

As reported on issue #357, the aws ses configuration was not able to
store because of the missing `ses` service config. Additionally was
added a `AWS Region` field to be used by the `ses`.

closes #357

app/Http/Controllers/V1/Admin/Settings/MailConfigurationController.php

@@ -58,6 +58,7 @@ class MailConfigurationController extends Controller
             'mail_mailgun_secret' => config('services.mailgun.secret'),
             'mail_ses_key' => config('services.ses.key'),
             'mail_ses_secret' => config('services.ses.secret'),
+            'mail_ses_region' => config('services.ses.region'),
         ];
 
         return response()->json($MailData);