op-node: Fix log message when bq does not match safe head (#3687)

The L2 head was being logged rather than the safe head's L1 origin.

op-node/rollup/derive/batch_queue.go

@@ -148,7 +148,7 @@ func (bq *BatchQueue) deriveNextBatch(ctx context.Context, outOfData bool, l2Saf
 	epoch := bq.l1Blocks[0]
 
 	if l2SafeHead.L1Origin != epoch.ID() {
-		return nil, NewResetError(fmt.Errorf("buffered L1 chain epoch %s in batch queue does not match safe head %s", epoch, l2SafeHead))
+		return nil, NewResetError(fmt.Errorf("buffered L1 chain epoch %s in batch queue does not match safe head origin %s", epoch, l2SafeHead.L1Origin))
 	}
 
 	// Find the first-seen batch that matches all validity conditions.