fix: loading reward

lib/core/widgets/dialog/reward_dialog.dart

@@ -89,9 +89,10 @@ class RewardDialog extends StatelessWidget {
                                   children: [
                                     Image.network(
                                       prize.imageURL ?? '',
-                                      loadingBuilder: (context, child, loadingProgress) => const SizedBox(
+                                      loadingBuilder: (context, child, loadingProgress) => SizedBox(
                                         height: 300,
                                         width: 300,
+                                        child: child,
                                       ),
                                       fit: BoxFit.cover,
                                     ),