Fix scalastyle check

Author: aajisaka

kyuubi-server/src/main/scala/org/apache/kyuubi/server/KinitAuxiliaryService.scala

@@ -44,9 +44,11 @@ class KinitAuxiliaryService() extends AbstractService("KinitAuxiliaryService") {
       kinitMaxAttempts = conf.get(KyuubiConf.KINIT_MAX_ATTEMPTS)
 
       require(keytab.nonEmpty && principal.nonEmpty, "principal or keytab is missing")
-      if (conf.get(KyuubiConf.ENGINE_DO_AS_ENABLED) && conf.get(KyuubiConf.SESSION_LOCAL_DIR_ALLOW_LIST).isEmpty) {
-        warn(s"User impersonation is enabled, but ${KyuubiConf.SESSION_LOCAL_DIR_ALLOW_LIST} is unset. " +
-          s"We strongly recommend to configure the allowed local dir list to exclude any credential including keytab.")
+      if (conf.get(KyuubiConf.ENGINE_DO_AS_ENABLED) &&
+        conf.get(KyuubiConf.SESSION_LOCAL_DIR_ALLOW_LIST).isEmpty) {
+        warn(s"User impersonation is enabled, but ${KyuubiConf.SESSION_LOCAL_DIR_ALLOW_LIST}" +
+          " is unset. We strongly recommend to configure the allowed local dir list" +
+          " to exclude any credential including keytab.")
       }
       UserGroupInformation.loginUserFromKeytab(principal.get, keytab.get)
       val krb5Conf = Option(System.getProperty("java.security.krb5.conf"))