Fixes cardox recipe (#4417)

-fixes #4415
-fixes gun offhand having pins
-fixes cloth having the same hardness as steel

code/modules/materials/materials.dm

@@ -697,6 +697,7 @@ var/list/name_to_material
 	melting_point = T0C+300
 	protectiveness = 1 // 4%
 	flags = MATERIAL_PADDING
+	hardness = 1
 
 /material/cult
 	name = "cult"

code/modules/projectiles/gun.dm

@@ -608,6 +608,7 @@
 	icon_state = "offhand"
 	item_state = "nothing"
 	name = "offhand"
+	needspin = FALSE
 
 	unwield()
 		if (ismob(loc))

code/modules/reagents/Chemistry-Recipes.dm

@@ -542,7 +542,7 @@
 	name = "Cardox"
 	id = "cardox"
 	result = "cardox"
-	required_reagents = list("platinum" = 1, "carbon" = 1, "sterilzine" = 1)
+	required_reagents = list("platinum" = 1, "carbon" = 1, "sterilizine" = 1)
 	result_amount = 3
 
 /datum/chemical_reaction/cardox_removal