Fix: correct caculations for mailcow widget (#4055)

src/widgets/mailcow/component.jsx

@@ -25,9 +25,9 @@ export default function Component({ service }) {
   }
 
   const domains = resultData.length;
-  const mailboxes = resultData.reduce((acc, val) => acc + val.mboxes_in_domain, 0);
-  const mails = resultData.reduce((acc, val) => acc + val.msgs_total, 0);
-  const storage = resultData.reduce((acc, val) => acc + val.bytes_total, 0);
+  const mailboxes = resultData.reduce((acc, val) => acc + parseInt(val.mboxes_in_domain, 10), 0);
+  const mails = resultData.reduce((acc, val) => acc + parseInt(val.msgs_total, 10), 0);
+  const storage = resultData.reduce((acc, val) => acc + parseInt(val.bytes_total, 10), 0);
 
   return (
     <Container service={service}>