set uninvitable after adding member

Author: danthe1st

src/main/java/net/discordjug/javabot/systems/moderation/report/ReportManager.java

@@ -87,7 +87,8 @@ private void createReportUserThread(ButtonInteractionEvent event, String[] id) {
 							+ "Messages sent in this thread can be seen by staff members but not other users.")
 					.addEmbeds(reportEmbeds)
 					.queue();
-				reporterThread.addThreadMember(event.getUser()).queue();
+				reporterThread.addThreadMember(event.getUser()).queue(success ->
+					reporterThread.getManager().setInvitable(false).queue());
 				reportThread
 					.sendMessageEmbeds(
 							new EmbedBuilder()