Add expense amount to TaxDetailUpdateDto

[adrianm]

On supplier invoices from EFH system there is sometimes a need to adjust the vat amount.

Visma.Net will not automatically recalculate the "expense amount" when the "deductable vat rate" is not 100%.

TaxDetailUpdateDto need "expenseAmount"

"taxDetailLines": [
  {
    "taxId": { "value": "string" },
    "taxableAmount": { "value": 0 },
    "vatAmount": { "value": 0 }
  }
]