fix[litemall-wx-api]: 解决潜在的警告信息

litemall-wx-api/src/main/java/org/linlinjava/litemall/wx/service/WxGrouponRuleService.java

@@ -32,7 +32,7 @@ public class WxGrouponRuleService {
 
 
     public List<GrouponRuleVo> queryList(Integer page, Integer size, String sort, String order) {
-        Page<LitemallGrouponRules> grouponRulesList = (Page)grouponRulesService.queryList(page, size, sort, order);
+        Page<LitemallGrouponRules> grouponRulesList = (Page<LitemallGrouponRules>)grouponRulesService.queryList(page, size, sort, order);
 
         Page<GrouponRuleVo> grouponList = new Page<GrouponRuleVo>();
         grouponList.setPages(grouponRulesList.getPages());