Update dns_loopia.sh

Loopia API is now less tolerant so we need another <value> tag surrounding the <struct>

dnsapi/dns_loopia.sh

@@ -206,6 +206,7 @@ _loopia_add_record() {
         <value><string>%s</string></value>
       </param>
       <param>
+        <value>
           <struct>
             <member>
               <name>type</name>
@@ -224,6 +225,7 @@ _loopia_add_record() {
               <value><string>%s</string></value>
             </member>
           </struct>
+        </value>
       </param>
     </params>
   </methodCall>' $LOOPIA_User $LOOPIA_Password "$domain" "$sub_domain" "$txtval")