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

resources/scripts/admin/stores/mail-driver.js

@@ -37,6 +37,7 @@ export const useMailDriverStore = (useWindow = false) => {
         mail_port: null,
         mail_ses_key: '',
         mail_ses_secret: '',
+        mail_ses_region: '',
         mail_encryption: 'tls',
         from_mail: '',
         from_name: '',