feat: remove useless code

powerjob-server/powerjob-server-starter/src/main/java/tech/powerjob/server/web/controller/InstanceController.java

@@ -54,8 +54,6 @@ public class InstanceController {
     @Resource
     private CacheService cacheService;
     @Resource
-    private AppInfoRepository appInfoRepository;
-    @Resource
     private InstanceInfoRepository instanceInfoRepository;
 
     @GetMapping("/stop")