Fix: Fix controller load order

CityDoctorParent/Extensions/CityDoctorGUI/src/main/java/de/hft/stuttgart/citydoctor2/gui/ZipEntryPicker.java

@@ -79,6 +79,8 @@ public class ZipEntryPicker {
     public ZipEntryPicker(Window parent, CityDoctorController controller) throws IOException {
         FXMLLoader loader = new FXMLLoader(ZipEntryPicker.class.getResource("ZipEntryPicker.fxml"));
         loader.setController(this);
+        this.controller = controller;
+        archive = controller.getZipArchive();
         VBox box = loader.load();
         this.controller = controller;
         stage = new Stage();