Changes investigate logs to use a define

code/modules/mob/living/carbon/human/human.dm

@@ -412,7 +412,7 @@
 										if(R)
 											if(H.canUseHUD())
 												if(istype(H.glasses, /obj/item/clothing/glasses/hud/security) || istype(H.getorganslot("eye_hud"), /obj/item/organ/cyberimp/eyes/hud/security))
-													investigate_log("[src.key] has been set from [R.fields["criminal"]] to [setcriminal] by [usr.name] ([usr.key]).", "records")
+													investigate_log("[src.key] has been set from [R.fields["criminal"]] to [setcriminal] by [usr.name] ([usr.key]).", INVESTIGATE_RECORDS)
 													R.fields["criminal"] = setcriminal
 													sec_hud_set_security_status()
 									return

code/modules/mob/living/carbon/human/human_defense.dm

@@ -620,7 +620,7 @@
 			gain = 100
 		if(mind.assigned_role == "Clown")
 			gain = rand(-300, 300)
-	investigate_log("([key_name(src)]) has been consumed by the singularity.","singulo") //Oh that's where the clown ended up!
+	investigate_log("([key_name(src)]) has been consumed by the singularity.", INVESTIGATE_SINGULO) //Oh that's where the clown ended up!
 	gib()
 	return(gain)
 

code/modules/mob/living/living_defense.dm

@@ -291,7 +291,7 @@
 
 /mob/living/singularity_act()
 	var/gain = 20
-	investigate_log("([key_name(src)]) has been consumed by the singularity.","singulo") //Oh that's where the clown ended up!
+	investigate_log("([key_name(src)]) has been consumed by the singularity.", INVESTIGATE_SINGULO) //Oh that's where the clown ended up!
 	gib()
 	return(gain)