fix(gui): use save mode for package directory export (PR #2937)

Author: HdShare

jadx-gui/src/main/java/jadx/gui/ui/filedialog/FileDialogWrapper.java

@@ -124,7 +124,7 @@ private void initForMode(FileOpenMode mode) {
 				break;
 
 			case EXPORT_NODE_FOLDER:
-				isOpen = true;
+				isOpen = false;
 				title = NLS.str("file.save_all_msg");
 				currentDir = mainWindow.getSettings().getLastSaveFilePath();
 				selectionMode = JFileChooser.DIRECTORIES_ONLY;

jadx-gui/src/main/java/jadx/gui/ui/popupmenu/JPackagePopupMenu.java

@@ -110,7 +110,7 @@ private static void saveJPackage(JPackage pkg, Path savePath, JClassExportType e
 		Path subSavePath = savePath.resolve(pkg.getName());
 		try {
 			if (!Files.isDirectory(subSavePath)) {
-				Files.createDirectory(subSavePath);
+				Files.createDirectories(subSavePath);
 			}
 		} catch (IOException e) {
 			throw new RuntimeException(e);