Added Eff_Heat status effect (#6572)

Thanks to @idk-whoami!

doc/item_bonus.txt

@@ -14,7 +14,8 @@ This list contains all available constants referenced in the 'bonus' commands.
 
 * Status effect (eff)
 	Eff_Bleeding, Eff_Blind, Eff_Burning, Eff_Confusion, Eff_Crystalize, Eff_Curse, Eff_DPoison,
-	Eff_Fear, Eff_Freeze, Eff_Poison, Eff_Silence, Eff_Sleep, Eff_Stone, Eff_Stun, Eff_Freezing
+	Eff_Fear, Eff_Freeze, Eff_Poison, Eff_Silence, Eff_Sleep, Eff_Stone, Eff_Stun, Eff_Freezing,
+	Eff_Heat
 
 * Element (e)
 	Ele_Dark, Ele_Earth, Ele_Fire, Ele_Ghost, Ele_Holy, Ele_Neutral, Ele_Poison,

src/map/script_constants.hpp

@@ -949,6 +949,7 @@
 	export_constant2("Eff_Burning",SC_BURNING);
 	export_constant2("Eff_Crystalize",SC_CRYSTALIZE);
 	export_constant2("Eff_Freezing",SC_FREEZING);
+	export_constant2("Eff_Heat",SC_BURNT);
 
 	export_constant2("SC_ALL",SC_NONE);