fix: update app_id maxlength to 7

src/templates/app/endpoint.jsx

@@ -21,7 +21,7 @@ const Endpoint = () => (
                             className='input-class'
                             type='text'
                             label={it.L('OAuth App ID')}
-                            attributes={{ maxLength: 5 }}
+                            attributes={{ maxLength: 7 }}
                             hint={it.L(
                                 'You have to register and get App ID before you can use different OAuth server for authentication. For more information refer to OAuth details on https://api.deriv.com/.'
                             )}