evidence: remove pubkey from duplicate vote evidence

this pr brings over the removal of pubkey from duplicatevote evidence from proto-breakage

ref #4580

evidence/reactor_test.go

@@ -13,7 +13,6 @@ import (
 	dbm "github.com/tendermint/tm-db"
 
 	cfg "github.com/tendermint/tendermint/config"
-	"github.com/tendermint/tendermint/crypto/secp256k1"
 	"github.com/tendermint/tendermint/libs/log"
 	"github.com/tendermint/tendermint/p2p"
 	sm "github.com/tendermint/tendermint/state"
@@ -214,7 +213,7 @@ func TestListMessageValidationBasic(t *testing.T) {
 		{"Good ListMessage", func(evList *ListMessage) {}, false},
 		{"Invalid ListMessage", func(evList *ListMessage) {
 			evList.Evidence = append(evList.Evidence,
-				&types.DuplicateVoteEvidence{PubKey: secp256k1.GenPrivKey().PubKey()})
+				&types.DuplicateVoteEvidence{})
 		}, true},
 	}
 	for _, tc := range testCases {