Fixed missing space in DeleteScheduler::BackgroundEmptyTrash log message (#7286)

Summary:
Example of a faulty log message:
Rate limiting is enabled with penalty 18203625after deleting file ...

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7286

Reviewed By: David132639

Differential Revision: D23215981

Pulled By: freewilll

fbshipit-source-id: 8bdbbffea9f2942cc7a652f315a560d61c0f1068

file/delete_scheduler.cc

@@ -258,7 +258,7 @@ void DeleteScheduler::BackgroundEmptyTrash() {
             ((total_deleted_bytes * kMicrosInSecond) / current_delete_rate);
         ROCKS_LOG_INFO(info_log_,
                        "Rate limiting is enabled with penalty %" PRIu64
-                       "after deleting file %s",
+                       " after deleting file %s",
                        total_penalty, path_in_trash.c_str());
         while (!closing_ && !cv_.TimedWait(start_time + total_penalty)) {
         }