remove unnecessary wrapper store in tests

This was causing a lot of warnings about not implementing View.

chain/gen/gen.go

@@ -14,7 +14,6 @@ import (
 	"github.com/filecoin-project/go-state-types/big"
 	"github.com/filecoin-project/go-state-types/crypto"
 	"github.com/google/uuid"
-	block "github.com/ipfs/go-block-format"
 	"github.com/ipfs/go-blockservice"
 	"github.com/ipfs/go-cid"
 	offline "github.com/ipfs/go-ipfs-exchange-offline"
@@ -85,19 +84,6 @@ type ChainGen struct {
 	lr repo.LockedRepo
 }
 
-type mybs struct {
-	blockstore.Blockstore
-}
-
-func (m mybs) Get(c cid.Cid) (block.Block, error) {
-	b, err := m.Blockstore.Get(c)
-	if err != nil {
-		return nil, err
-	}
-
-	return b, nil
-}
-
 var rootkeyMultisig = genesis.MultisigMeta{
 	Signers:         []address.Address{remAccTestKey},
 	Threshold:       1,
@@ -152,8 +138,6 @@ func NewGeneratorWithSectors(numSectors int) (*ChainGen, error) {
 		}
 	}()
 
-	bs = mybs{bs}
-
 	ks, err := lr.KeyStore()
 	if err != nil {
 		return nil, xerrors.Errorf("getting repo keystore failed: %w", err)