message: op-batcher: Remove unused lastKnownL1Time
diff: @@ -32,10 +32,6 @@ type BatchSubmitter struct {
  // lastStoredBlock is the last block loaded into `state`. If it is empty it should be set to the l2 safe head.
  lastStoredBlock eth.BlockID
  - // latest known L1 timestamp - used in unlikely case that a header cannot be
  - // retrieved
  - lastKnownL1Time uint64
  -
  state *channelManager
  }
  @@ -300,6 +296,5 @@ func (l *BatchSubmitter) l1Tip(ctx context.Context) (eth.L1BlockRef, error) {
  if err != nil {
  return eth.L1BlockRef{}, fmt.Errorf("getting latest L1 block: %w", err)
  }
  - l.lastKnownL1Time = head.Time
  return eth.L1BlockRefFromHeader(head), nil
  }
  