fix: remove erigon's --chain parameter (#575)

Erigon will disable discovery when --chain=dev:
https://github.com/ledgerwatch/erigon/blob/3323fdc3489d845e9db607ad5ccc2190421b699d/cmd/utils/flags.go#L1322-L1331
So with the current Kurtosis startup parameter, Erigon will not connect
to other EL nodes.
Therefore, I propose deleting this --chain parameter in the Starlark
script. If users want, they can pass the parameter through the
"el_extra_params" configuration.
Signed-off-by: lyfsn <dev.wangyu@proton.me>

src/el/erigon/erigon_launcher.star

@@ -188,9 +188,6 @@ def get_config(
 
     cmd = [
         "erigon",
-        "--chain={0}".format(
-            network if network in constants.PUBLIC_NETWORKS else "dev"
-        ),
         "{0}".format(
             "--override.cancun=" + str(cancun_time)
             if constants.NETWORK_NAME.shadowfork in network