zombienet_tests: Fix genesis error in 0006-parachains-max-tranche0.toml (#2191)

There was a race in merging between
https://github.com/paritytech/polkadot-sdk/pull/1256 and
https://github.com/paritytech/polkadot-sdk/pull/1178, so this newly
added tests wasn't updated with the new path for the configuration, so
fix that.

Signed-off-by: Alexandru Gheorghe <alexandru.gheorghe@parity.io>

polkadot/zombienet_tests/functional/0006-parachains-max-tranche0.toml

@@ -2,7 +2,7 @@
 timeout = 1000
 bootnode = true
 
-[relaychain.genesis.runtime.configuration.config]
+[relaychain.genesis.runtimeGenesis.patch.configuration.config]
   max_validators_per_core = 1
   needed_approvals = 7
   relay_vrf_modulo_samples = 5