Fix genesis

beacon_node/http_api/tests/tests.rs

@@ -305,6 +305,7 @@ impl ApiTester {
             BeaconChainHarness::builder(MainnetEthSpec)
                 .default_spec()
                 .deterministic_keypairs(VALIDATOR_COUNT)
+                .deterministic_withdrawal_keypairs(VALIDATOR_COUNT)
                 .fresh_ephemeral_store()
                 .build(),
         );