Use minetest_game steel sign to craft the various colored metal signs

instead of using steel ingots.  Reduced yield to one per craft.

(the "sheet metal" recipes still exist for users of "steel" mod, yield
there is unchanged)

init.lua

@@ -141,6 +141,8 @@ else
 	default_sign_image = "default_sign_wall.png"
 end
 
+default_sign_metal = "default:sign_wall_steel"
+
 --table copy
 
 function signs_lib.table_copy(t)
@@ -958,7 +960,7 @@ minetest.register_craft({
 	}
 })
 
---Alternate recipe.
+--Alternate recipes.
 
 minetest.register_craft({
     	output = "locked_sign:sign_wall_locked",
@@ -968,13 +970,21 @@ minetest.register_craft({
     },
 })
 
+minetest.register_craft({
+    	output = "locked_sign:sign_wall_locked",
+    	recipe = {
+        	{default_sign_metal},
+        	{"default:steel_ingot"},
+    },
+})
+
 -- craft recipes for the metal signs
 
 minetest.register_craft( {
-        output = "signs:sign_wall_green 4",
+        output = "signs:sign_wall_green",
         recipe = {
 			{ "dye:dark_green", "dye:white", "dye:dark_green" },
-			{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" }
+			{ "", default_sign_metal, "" }
         },
 })
 
@@ -987,10 +997,10 @@ minetest.register_craft( {
 })
 
 minetest.register_craft( {
-        output = "signs:sign_wall_yellow 4",
+        output = "signs:sign_wall_yellow",
         recipe = {
 			{ "dye:yellow", "dye:black", "dye:yellow" },
-			{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" }
+			{ "", default_sign_metal, "" }
         },
 })
 
@@ -1003,10 +1013,10 @@ minetest.register_craft( {
 })
 
 minetest.register_craft( {
-        output = "signs:sign_wall_red 4",
+        output = "signs:sign_wall_red",
         recipe = {
 			{ "dye:red", "dye:white", "dye:red" },
-			{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" }
+			{ "", default_sign_metal, "" }
         },
 })
 
@@ -1019,10 +1029,10 @@ minetest.register_craft( {
 })
 
 minetest.register_craft( {
-        output = "signs:sign_wall_white_red 4",
+        output = "signs:sign_wall_white_red",
         recipe = {
 			{ "dye:white", "dye:red", "dye:white" },
-			{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" }
+			{ "", default_sign_metal, "" }
         },
 })
 
@@ -1035,10 +1045,10 @@ minetest.register_craft( {
 })
 
 minetest.register_craft( {
-        output = "signs:sign_wall_white_black 4",
+        output = "signs:sign_wall_white_black",
         recipe = {
 			{ "dye:white", "dye:black", "dye:white" },
-			{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" }
+			{ "", default_sign_metal, "" }
         },
 })
 
@@ -1051,10 +1061,10 @@ minetest.register_craft( {
 })
 
 minetest.register_craft( {
-        output = "signs:sign_wall_orange 4",
+        output = "signs:sign_wall_orange",
         recipe = {
 			{ "dye:orange", "dye:black", "dye:orange" },
-			{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" }
+			{ "", default_sign_metal, "" }
         },
 })
 
@@ -1067,10 +1077,10 @@ minetest.register_craft( {
 })
 
 minetest.register_craft( {
-        output = "signs:sign_wall_blue 4",
+        output = "signs:sign_wall_blue",
         recipe = {
 			{ "dye:blue", "dye:white", "dye:blue" },
-			{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" }
+			{ "", default_sign_metal, "" }
         },
 })
 
@@ -1083,10 +1093,10 @@ minetest.register_craft( {
 })
 
 minetest.register_craft( {
-        output = "signs:sign_wall_brown 4",
+        output = "signs:sign_wall_brown",
         recipe = {
 			{ "dye:brown", "dye:white", "dye:brown" },
-			{ "default:steel_ingot", "default:steel_ingot", "default:steel_ingot" }
+			{ "", default_sign_metal, "" }
         },
 })