fix dialog flow and cleanup listeners

src/main/java/eu/mhsl/craftattack/loginServer/Dialog.java

@@ -53,14 +53,14 @@ public final class Dialog {
     }
 
     public static boolean handleClick(Player player, DialogState state, Key key, CompoundBinaryTag payload) {
-        saveCurrentPage(state, payload);
-
         if (key.equals(backKey)) {
             state.previousPage();
             showPage(player, state, null);
             return false;
         }
 
+        saveCurrentPage(state, payload);
+
         Component error = validateCurrentPage(player, state);
         if (error != null) {
             showPage(player, state, error);
@@ -144,13 +144,13 @@ public final class Dialog {
                         null,
                         false,
                         false,
-                        DialogAfterAction.CLOSE,
+                        state.isLastPage() ? DialogAfterAction.CLOSE : DialogAfterAction.NONE,
                         body,
                         inputs
                 ),
                 buttons,
-                null,            // kein extra Exit-Button
-                2                // Spalten
+                null,
+                2
         ));
     }