fix: reading pubkey from ledger panic

[j75689]

Description

./build/bnbcli keys add validator --ledger    

panic: length of pubkey is incorrect,length: 0, pubKey: PubKeySecp256k1{}

goroutine 1 [running]:
github.com/tendermint/tendermint/crypto/secp256k1.PubKeySecp256k1.Address({0x0, 0x0, 0x0})
        /Users/dylan.huang/go/pkg/mod/github.com/bnb-chain/bnc-tendermint@v0.32.3-bc.10/crypto/secp256k1/secp256k1.go:197 +0x184
github.com/cosmos/cosmos-sdk/crypto/keys.ledgerInfo.GetAddress(...)
        /Users/dylan.huang/go/pkg/mod/github.com/bnb-chain/bnc-cosmos-sdk@v0.26.4/crypto/keys/types.go:154
github.com/cosmos/cosmos-sdk/crypto/keys.dbKeybase.writeInfo({{0x103dd45a8?, 0x14000010858?}}, {0x103dcdbc0, 0x140002ec040}, {0x16ce5b408?, 0x1400032c108?})
        /Users/dylan.huang/go/pkg/mod/github.com/bnb-chain/bnc-cosmos-sdk@v0.26.4/crypto/keys/keybase.go:474 +0xf0
github.com/cosmos/cosmos-sdk/crypto/keys.dbKeybase.writeLedgerKey({{0x103dd45a8?, 0x14000010858?}}, {0x103dcec60?, 0x104456780}, {0x1400032c108, 0x5, 0x5}, {0x16ce5b408, 0x9})
        /Users/dylan.huang/go/pkg/mod/github.com/bnb-chain/bnc-cosmos-sdk@v0.26.4/crypto/keys/keybase.go:459 +0xfc
github.com/cosmos/cosmos-sdk/crypto/keys.dbKeybase.CreateLedger({{0x103dd45a8?, 0x14000010858?}}, {0x16ce5b408, 0x9}, {0x1400032c108, 0x5, 0x5}, {0x10386124d?, 0x103c5cd01?})
        /Users/dylan.huang/go/pkg/mod/github.com/bnb-chain/bnc-cosmos-sdk@v0.26.4/crypto/keys/keybase.go:172 +0xf8
github.com/cosmos/cosmos-sdk/client/keys.runAddCmd(0x140002ebb80?, {0x1400038c1e0, 0x1, 0x2?})
        /Users/dylan.huang/go/pkg/mod/github.com/bnb-chain/bnc-cosmos-sdk@v0.26.4/client/keys/add.go:113 +0x41c
github.com/spf13/cobra.(*Command).execute(0x140002ebb80, {0x1400038c160, 0x2, 0x2})
        /Users/dylan.huang/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:826 +0x4c4
github.com/spf13/cobra.(*Command).ExecuteC(0x104414c60)
        /Users/dylan.huang/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:914 +0x2a4
github.com/spf13/cobra.(*Command).Execute(...)
        /Users/dylan.huang/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:864
github.com/tendermint/tendermint/libs/cli.Executor.Execute({0x104414c60?, 0x103dc12e8?})
        /Users/dylan.huang/go/pkg/mod/github.com/bnb-chain/bnc-tendermint@v0.32.3-bc.10/libs/cli/setup.go:89 +0x38
main.main()
        /Users/dylan.huang/git/node/cmd/bnbcli/main.go:104 +0x60c

Rationale

tmsecp256k1.PubKeySecp256k1 does not pre-allocate the length, resulting in no actual effect when copying bytes

[codecov-commenter]

Codecov Report

Merging #350 (164d949) into master (259050b) will decrease coverage by 0.87%.
The diff coverage is 4.70%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #350      +/-   ##
==========================================
- Coverage   46.78%   45.91%   -0.87%     
==========================================
  Files         247      248       +1     
  Lines       23741    24212     +471     
==========================================
+ Hits        11107    11118      +11     
- Misses      11968    12428     +460     
  Partials      666      666