Fix time unit in the ttl log (#7627)

Author: HeimingZ

server/src/main/java/org/apache/iotdb/db/engine/storagegroup/VirtualStorageGroupProcessor.java

@@ -1519,10 +1519,11 @@ private void checkFileTTL(TsFileResource resource, long ttlLowerBound, boolean i
         resource.remove();
         tsFileManager.remove(resource, isSeq);
         logger.info(
-            "Removed a file {} before {} by ttl ({}ms)",
+            "Removed a file {} before {} by ttl ({} {})",
             resource.getTsFilePath(),
             new Date(ttlLowerBound),
-            dataTTL);
+            dataTTL,
+            config.getTimestampPrecision());
       } finally {
         resource.writeUnlock();
       }