OO-4733: missing save value for guest fllag in meeting editor

src/main/java/org/olat/modules/bigbluebutton/ui/EditBigBlueButtonMeetingController.java

@@ -204,6 +204,7 @@ public class EditBigBlueButtonMeetingController extends FormBasicController {
 		String[] guestValues = new String[] { translate("meeting.guest.on") };
 		guestEl = uifactory.addCheckboxesHorizontal("meeting.guest", formLayout, onKeys, guestValues);
 		guestEl.setVisible(entry != null && entry.isGuests());
+		guestEl.select(onKeys[0], meeting != null && meeting.isGuest());
 		
 		String externalLink = meeting == null ? null : meeting.getReadableIdentifier();
 		externalLinkEl = uifactory.addTextElement("meeting.external.users", 64, externalLink, formLayout);