Added missing export for bWeaponSubSize (#6651)

Fixes #6650

Authored-by: Cydh <cydh.ramdh@gmail.com>

src/map/script_constants.hpp

@@ -845,6 +845,7 @@
 	export_constant2("bReduceDamageReturn",SP_REDUCE_DAMAGE_RETURN);
 	export_constant2("bAddItemSPHealRate", SP_ADD_ITEM_SPHEAL_RATE);
 	export_constant2("bAddItemGroupSPHealRate", SP_ADD_ITEMGROUP_SPHEAL_RATE);
+	export_constant2("bWeaponSubSize", SP_WEAPON_SUBSIZE);
 
 	/* equip indices */
 	export_constant(EQI_COMPOUND_ON);