fix: fix issue with template/base

Author: AverageGithub

src/main/java/com/artillexstudios/axsmithing/gui/impl/SmithingTable_V1_16.java

@@ -196,7 +196,7 @@ private void updateGui(Inventory inv) {
                 addition = new ItemStack(Material.AIR);
             }
 
-            if (base == null || addition.getType().isAir()) {
+            if (base == null || base.getType().isAir()) {
                 base = new ItemStack(Material.AIR);
             }
 

src/main/java/com/artillexstudios/axsmithing/gui/impl/SmithingTable_V1_20.java

@@ -233,11 +233,11 @@ private void updateGui(Inventory inv) {
                 addition = new ItemStack(Material.AIR);
             }
 
-            if (base == null || addition.getType().isAir()) {
+            if (base == null || base.getType().isAir()) {
                 base = new ItemStack(Material.AIR);
             }
 
-            if (template == null || addition.getType().isAir()) {
+            if (template == null || template.getType().isAir()) {
                 if (!needNetheriteTemplate) {
                     template = new ItemStack(Material.NETHERITE_UPGRADE_SMITHING_TEMPLATE);
                 } else {