kv: remove unnecessary check

PR cockroachdb#44507 has left an unnecessary check in place. The check tolerates
requests with the WriteTooOld flag set for leaf txn, even though the
same commit makes sure that leaves reset that flag.

Release note: None

pkg/kv/txn_interceptor_span_refresher.go

@@ -225,7 +225,7 @@ func (sr *txnSpanRefresher) SendLocked(
 func (sr *txnSpanRefresher) sendLockedWithRefreshAttempts(
 	ctx context.Context, ba roachpb.BatchRequest, maxRefreshAttempts int,
 ) (*roachpb.BatchResponse, *roachpb.Error) {
-	if ba.Txn.WriteTooOld && sr.canAutoRetry {
+	if ba.Txn.WriteTooOld {
 		// The WriteTooOld flag is not supposed to be set on requests. It's only set
 		// by the server and it's terminated by this interceptor on the client.
 		log.Fatalf(ctx, "unexpected WriteTooOld request. ba: %s (txn: %s)",