Merge pull request #9788 from f321x/fix_update_amount

fix: SendTab not updating amount after text input change

electrum/payment_identifier.py

@@ -689,7 +689,7 @@ def invoice_from_payment_identifier(
         invoice = pi.bolt11
         if not invoice:
             return
-        if invoice.amount_msat is None:
+        if invoice._lnaddr.get_amount_msat() is None:
             invoice.set_amount_msat(int(amount_sat * 1000))
         return invoice
     else: