Refactor: Add refreshing of ZipEntryList

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

@@ -143,13 +143,17 @@ public class ZipEntryPicker {
     }
 
     private void populateZipEntryList() {
+        populateZipEntryList(0);
+    }
+
+    private void populateZipEntryList(int selectionIndex) {
         entryList.getItems().clear();
         entryList.setCellFactory(param -> new ZipEntryListCell());
         for (CityGmlZipEntry entry : archive.getEntries()) {
             entryList.getItems().add(new ZipEntryNode(entry));
         }
         entryList.getSelectionModel().clearSelection();
-        entryList.getSelectionModel().select(0);
+        entryList.getSelectionModel().select(selectionIndex);
         showMetadata(entryList.getSelectionModel().getSelectedItem().getEntry());
     }