fix style

Author: Sunny Jiao

framework/src/main/java/org/tron/core/Wallet.java

@@ -786,8 +786,8 @@ public WitnessList getPaginatedNowWitnessList(long offset, long limit) throws
       return retry error.
     */
     if (chainBaseManager.getDynamicPropertiesStore().getStateFlag() == 1) {
-      String message = "Service temporarily unavailable during maintenance period. " +
-          "Please try again later.";
+      String message =
+          "Service temporarily unavailable during maintenance period. Please try again later.";
       throw new MaintenanceUnavailableException(message);
     }
     // It contains the final vote count at the end of the last epoch.