use getJumpUrl instead of manually encoding Discord URL

Author: danthe1st

src/main/java/net/javadiscord/javabot/systems/help/HelpForumUpdater.java

@@ -99,7 +99,7 @@ private MessageEmbed createDMDormantInfo(ThreadChannel post, HelpConfig config)
 								post.getAsMention(),
 								post.getParentChannel().getAsMention(),
 								config.getInactivityTimeoutMinutes(),
-								"https://discord.com/channels/" + post.getGuild().getId() + "/" + post.getId()))
+								post.getJumpUrl()))
 				.build()
 				;
 	}