Fix `TomcatWebServerFactoryCustomizer` to restore Spring Boot 2.0 behavior where a negative or zero `max-http-header-size` indicates that the server default should be used. See gh-14986
Fix `TomcatWebServerFactoryCustomizer` to restore Spring Boot 2.0 behavior where a negative or zero `max-http-header-size` indicates that the server default should be used. See gh-14986