修复图片广场显示问题

lib/pages/ai-draw-image/controller.dart

@@ -23,6 +23,7 @@ import 'model.dart';
 class AIDrawImageController extends GetxController {
   late TabController tabController;
   late TabController categoryController;
+  var currentIndex = 0;
   
   ScrollController textToImageController = ScrollController(initialScrollOffset: 0);
   var model = AIDrawTextToImageModel();

lib/pages/ai-draw-image/view.dart

@@ -110,9 +110,10 @@ class AIDrawImagePage extends GetView<AIDrawImageController>  {
         });
         controller.tabController = tabController;
         tabController.addListener(() {
-          if (tabController.index == 2) {
+          if (tabController.index == 2 && controller.currentIndex != tabController.index) {
             controller.requestSquareImages();
           }
+          controller.currentIndex = tabController.index;
         });
         return Column(
           children: [