Fixed that if continuationId is set and followUpResponse != null, then callback hasn't been called

fints4k/src/commonMain/kotlin/net/dankito/banking/fints/FinTsClient.kt

@@ -619,6 +619,9 @@ open class FinTsClient(
                                 callback(handledResponse)
                             }
                         }
+                        else {
+                            callback(handledResponse)
+                        }
                     }
                     ?: run {
                         dialogContext.chunkedResponseHandler?.invoke(handledResponse)