Remove erroneous management.server.address config from Actuator smoke test

See gh-22187

Author: wilkinsona

spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-actuator/src/main/resources/application.properties

@@ -5,7 +5,6 @@ spring.security.user.password=password
 
 # logging.file.name=/tmp/logs/app.log
 # logging.level.org.springframework.security=DEBUG
-management.server.address=127.0.0.1
 
 management.endpoints.web.exposure.include=*
 management.endpoint.shutdown.enabled=true