fix txtree selection bug when preselecting a txi/txo on opening the editor for the first time

src/main/java/com/sparrowwallet/sparrow/transaction/TransactionController.java

@@ -270,7 +270,7 @@ public class TransactionController implements Initializable {
         });
 
         if(initialView != null) {
-            setTreeSelection(initialView, initialIndex);
+            Platform.runLater(() -> setTreeSelection(initialView, initialIndex));
         } else {
             txtree.getSelectionModel().select(txtree.getRoot());
         }