Admin API duplicated register

[ceyonur]

From: ava-labs/avalanchego#2243

A developer is trying to run AvalancheGo 1.10.14 with SubnetEVM 0.5.8 and running into the following error:

ERROR server/server.go:185 failed to create handlers {"chainName": "guvaqv679hxAjtD3Xq9QPVCAtqHERdazVz7eb8dPJYnj36kaw", "error": "rpc error: code = Unknown desc = failed to register service for admin API due to rpc: service already defined: \"admin\""}