Try to set `beacon-spec-mainnet` as default on runtime and not binary (#2777)

cumulus/parachains/runtimes/bridge-hubs/bridge-hub-rococo/Cargo.toml

@@ -130,7 +130,7 @@ bridge-runtime-common = { path = "../../../../../bridges/bin/runtime-common", fe
 sp-keyring = { path = "../../../../../substrate/primitives/keyring" }
 
 [features]
-default = ["std"]
+default = ["beacon-spec-mainnet", "std"]
 std = [
 	"bp-asset-hub-rococo/std",
 	"bp-asset-hub-westend/std",

cumulus/polkadot-parachain/Cargo.toml

@@ -118,13 +118,10 @@ tokio = { version = "1.32.0", features = ["macros", "parking_lot", "time"] }
 wait-timeout = "0.2"
 
 [features]
-default = [
-	"beacon-spec-mainnet",
-]
+default = []
 runtime-benchmarks = [
 	"asset-hub-rococo-runtime/runtime-benchmarks",
 	"asset-hub-westend-runtime/runtime-benchmarks",
-	"beacon-spec-mainnet",
 	"bridge-hub-rococo-runtime/runtime-benchmarks",
 	"bridge-hub-westend-runtime/runtime-benchmarks",
 	"collectives-westend-runtime/runtime-benchmarks",
@@ -164,6 +161,3 @@ try-runtime = [
 	"shell-runtime/try-runtime",
 	"sp-runtime/try-runtime",
 ]
-beacon-spec-mainnet = [
-	"bridge-hub-rococo-runtime/beacon-spec-mainnet",
-]