Mhelp/ahelp fixes. (#25122)

Co-authored-by: FunnyMan3595 (Charlie Nolan) <funnyman@google.com>
Co-authored-by: AffectedArc07 <25063394+AffectedArc07@users.noreply.github.com>

code/modules/client/client_defines.dm

@@ -11,7 +11,7 @@
 	var/last_message	= "" //contains the last message sent by this client - used to protect against copy-paste spamming.
 	var/last_message_count = 0 //contains a number of how many times a message identical to last_message was sent.
 	var/last_message_time = 0 //holds the last time (based on world.time) a message was sent
-	var/datum/pm_tracker/pm_tracker = new()
+	var/datum/pm_tracker/pm_tracker
 
 		/////////
 		//OTHER//

code/modules/client/client_procs.dm

@@ -262,6 +262,9 @@
 	stat_panel = new(src, "statbrowser")
 	stat_panel.subscribe(src, PROC_REF(on_stat_panel_message))
 
+	// Create a PM tracker bound to this ckey.
+	pm_tracker = new(ckey)
+
 	tgui_panel = new(src, "browseroutput")
 	tgui_say = new(src, "tgui_say")
 	TopicData = null							//Prevent calls to client.Topic from connect