dashboard: use default console log format of Spring Boot

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

sentinel-dashboard/src/main/resources/application.properties

@@ -6,6 +6,5 @@ spring.http.encoding.enabled=true
 #logging settings
 logging.level.org.springframework.web=INFO
 logging.file=${user.home}/logs/csp/sentinel-dashboard.log
-logging.pattern.console= %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
 logging.pattern.file= %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
-
+#logging.pattern.console= %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n