修复库存不是获取实时库存的bug

app/Http/Transformers/ExchangeSettingTransformer.php

@@ -10,6 +10,8 @@ class ExchangeSettingTransformer
     {
         if (isset($data['data']) && is_array($data['data'])) {
             foreach ($data['data'] as $key => &$value) {
+                $value['stock'] = $value['available_stock'];
+                unset($value['available_stock']);
                 unset($value['add_time']);
                 unset($value['update_time']);
                 unset($value['status']);