Backport fix (for wasm `std` env) (#2340)

* Backport fix (for wasm `std` env)

# Conflicts:
#	primitives/chain-bridge-hub-polkadot/src/lib.rs
#	primitives/chain-bridge-hub-wococo/src/lib.rs
#	primitives/chain-rococo/src/lib.rs

* Polkadot/Westend

* Cargo.lock