SPIGOT-4296: Ensure recipe group set in craft translation

src/main/java/org/bukkit/craftbukkit/inventory/CraftFurnaceRecipe.java

@@ -18,7 +18,9 @@ public class CraftFurnaceRecipe extends FurnaceRecipe implements CraftRecipe {
         if (recipe instanceof CraftFurnaceRecipe) {
             return (CraftFurnaceRecipe) recipe;
         }
-        return new CraftFurnaceRecipe(recipe.getKey(), recipe.getResult(), recipe.getInput(), recipe.getExperience(), recipe.getCookingTime());
+        CraftFurnaceRecipe ret = new CraftFurnaceRecipe(recipe.getKey(), recipe.getResult(), recipe.getInput(), recipe.getExperience(), recipe.getCookingTime());
+        ret.setGroup(recipe.getGroup());
+        return ret;
     }
 
     @Override

src/main/java/org/bukkit/craftbukkit/inventory/CraftShapedRecipe.java

@@ -31,6 +31,7 @@ public class CraftShapedRecipe extends ShapedRecipe implements CraftRecipe {
             return (CraftShapedRecipe) recipe;
         }
         CraftShapedRecipe ret = new CraftShapedRecipe(recipe.getKey(), recipe.getResult());
+        ret.setGroup(recipe.getGroup());
         String[] shape = recipe.getShape();
         ret.shape(shape);
         Map<Character, ItemStack> ingredientMap = recipe.getIngredientMap();

src/main/java/org/bukkit/craftbukkit/inventory/CraftShapelessRecipe.java

@@ -31,6 +31,7 @@ public class CraftShapelessRecipe extends ShapelessRecipe implements CraftRecipe
             return (CraftShapelessRecipe) recipe;
         }
         CraftShapelessRecipe ret = new CraftShapelessRecipe(recipe.getKey(), recipe.getResult());
+        ret.setGroup(recipe.getGroup());
         for (ItemStack ingred : recipe.getIngredientList()) {
             ret.addIngredient(ingred.getType(), ingred.getDurability());
         }