optimize config demo

spring-cloud-tencent-examples/polaris-config-example/src/main/java/com/tencent/cloud/polaris/config/example/ConfigController.java

@@ -29,7 +29,6 @@ import org.springframework.web.bind.annotation.RestController;
  * @author lepdou 2022-03-10
  */
 @RestController
-@RefreshScope
 public class ConfigController {
 
 	@Value("${timeout:1000}")

spring-cloud-tencent-examples/polaris-config-example/src/main/resources/bootstrap.yml

@@ -12,7 +12,6 @@ spring:
         groups:
           - name: ${spring.application.name} # group name
             files: [ "config/application.properties", "config/bootstrap.yml" ] # config/application.properties takes precedence over config/bootstrap.yml
-        refresh-type: refresh_context
 management:
   endpoints:
     web: