config: fix CreateConsensusEngineBareBones (#8154)

Fix ``CreateConsensusEngineBareBones`` for bor and aura. Current codes
will pass a ``**chain.BorConfig`` or ``**chain.AuraConfig to``
``CreateConsensusEngine`` and cause a panic

Co-authored-by: Maohua Zhu <zhumaohua@cobo.com>

eth/ethconsensusconfig/config.go

@@ -132,9 +132,9 @@ func CreateConsensusEngineBareBones(chainConfig *chain.Config, logger log.Logger
 	if chainConfig.Clique != nil {
 		consensusConfig = params.CliqueSnapshot
 	} else if chainConfig.Aura != nil {
-		consensusConfig = &chainConfig.Aura
+		consensusConfig = chainConfig.Aura
 	} else if chainConfig.Bor != nil {
-		consensusConfig = &chainConfig.Bor
+		consensusConfig = chainConfig.Bor
 	} else {
 		var ethashCfg ethashcfg.Config
 		ethashCfg.PowMode = ethashcfg.ModeFake