Fix empty forkid and parenthash in l2block read from datastream #1756
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Fixes #1740
Original l2block in proto doesn't have forkid and parenthash. I believe this is a bug of implementation because the type
FullL2Block
read from datastream has these two fields and now they are both empty. After this fix, they will be written to datastream correctly, and ReadBatches in data_stream_server.go can read out all fields correctly.