Emergency threat curve adjustment

We've successfully lowered threat by altering the threat curve centre before, this commit redoes that. It's needed as rounds have been utter crazy, one or two seccies have to deal with not only equal numbers of traitors, but sentient diseases, heretics and other stuff on top.

code/game/gamemodes/dynamic/dynamic.dm

@@ -105,7 +105,8 @@ GLOBAL_VAR_INIT(dynamic_forced_threat_level, -1)
 	/// A number between -5 and +5.
 	/// A negative value will give a more peaceful round and
 	/// a positive value will give a round with higher threat.
-	var/threat_curve_centre = 0
+	//var/threat_curve_centre = 0	//Bubber Edit: Original
+	var/threat_curve_centre = -2	//Bubber Edit: Lowered threat curve
 
 	/// A number between 0.5 and 4.
 	/// Higher value will favour extreme rounds and