fix: retain full error information for blocking writes (#293)

api/writeAPIBlocking.go

@@ -74,7 +74,7 @@ func NewWriteAPIBlocking(org string, bucket string, service http2.Service, write
 func (w *writeAPIBlocking) write(ctx context.Context, line string) error {
 	err := w.service.WriteBatch(ctx, iwrite.NewBatch(line, w.writeOptions.RetryInterval(), w.writeOptions.MaxRetryTime()))
 	if err != nil {
-		return err.Unwrap()
+		return err
 	}
 	return nil
 }