chore: Make field final

Author: Hendrix-Shen

src/main/java/cn/msdnicrosoft/commandbuttons/gui/CommandEditGUI.java

@@ -17,15 +17,14 @@
 
 public class CommandEditGUI extends LightweightGuiDescription {
     private final BiConsumer<Text, CommandItemDestination> creator = this::defBtnBehavior;
-
     private final WGridPanel root = new WGridPanel(5);
     private final CommandItem item;
     private final WTextField displayName = new WTextField().setSuggestion(Component.translatable("mgbuttons.gui.edit.name"));
     private final WTextField input = new WTextField().setSuggestion(Component.translatable("mgbuttons.gui.edit.type")).setMaxLength(Integer.MAX_VALUE);
     private final WButton addBtn = new WButton(Component.literal("+")).setOnClick(this::addBtnCallback);
 
     private final CommandEditListPanel<Text, CommandItemDestination> raw;
-    private boolean editMode;
+    private final boolean editMode;
 
     public CommandEditGUI(CommandItem item) {
         this(item, false);
@@ -96,7 +95,6 @@ private void defBtnBehavior(Text text, @NotNull CommandItemDestination commandIt
     public void saveData() {
         if (!this.editMode) {
             ConfigManager.add(item);
-            this.editMode = true;
         }
         ConfigManager.save();
     }