Update PolarisServiceRegistryAutoConfiguration.java

spring-cloud-starter-tencent-polaris-discovery/src/main/java/com/tencent/cloud/polaris/registry/PolarisServiceRegistryAutoConfiguration.java

@@ -44,7 +44,7 @@ import org.springframework.context.annotation.Configuration;
 @Configuration(proxyBeanMethods = false)
 @EnableConfigurationProperties
 @ConditionalOnPolarisRegisterEnabled
-@ConditionalOnProperty(value = "spring.cloud.service-registry.graceful-registration.enabled")
+@ConditionalOnProperty(value = "spring.cloud.service-registry.graceful-registration.enabled", matchIfMissing = false)
 @AutoConfigureAfter({GracefulServiceRegistrationConfiguration.class,
 		GracefulServiceRegistrationAutoConfiguration.class,
 		PolarisDiscoveryAutoConfiguration.class})