remove non-booked transactions from import

src/app-gocardless/banks/ssk_dusseldorf_dussdeddxxx.js

@@ -7,6 +7,14 @@ export default {
   institutionIds: ['SSK_DUSSELDORF_DUSSDEDDXXX'],
 
   normalizeTransaction(transaction, _booked) {
+    // If the transaction is not booked yet by the bank, don't import it.
+    // Reason being that the transaction doesn't have the information yet
+    // to make the payee and notes field be of any use. It's filled with 
+    // a placeholder text and wouldn't be corrected on the next sync.
+    if (!_booked) {
+      return null;
+    }
+
     // Prioritize unstructured information, falling back to structured formats
     let remittanceInformationUnstructured =
       transaction.remittanceInformationUnstructured ??