Fixed duplication bug

Fixed a little bug within the recipe registration which causes to
duplicate shingles when crafted from slopes.

slopes.lua

@@ -153,13 +153,13 @@ homedecor_register_slope = function(modname, subname, recipeitem, groups, images
 
 	minetest.register_craft({
 		type = "shapeless",
-		output = recipeitem.." 3",
+		output = recipeitem.." 1",
 		recipe = { modname..":shingle_outer_corner_"..subname }
 	})
 
 	minetest.register_craft({
 		type = "shapeless",
-		output = recipeitem.." 3",
+		output = recipeitem.." 1",
 		recipe = { modname..":shingle_inner_corner_"..subname }
 	})
 end