feat: correct total tax on incoming invoices

frontend/pages/incomingInvoices/index.vue

@@ -141,12 +141,7 @@ const displayCurrency = (value, currency = "€") => {
   return `${Number(value).toFixed(2).replace(".",",")} ${currency}`
 }
 const getInvoiceSum = (invoice) => {
-  let sum = 0
-  invoice.accounts.forEach(account => {
-    sum += account.amountTax
-    sum += account.amountNet
-  })
-  return sum.toFixed(2)
+  return useSum().getIncomingInvoiceSum(invoice)
 }
 
 const getPaidAmount = (item) => {