Bug: correct withdrawals root when sealing

[mempirate]

Description

We should get the storage root of the L1 to L1 message passer and set that as the withdrawals hash, like in based-op-geth:
https://github.com/gattaca-com/based-op-geth/blob/b92460b0d0c5eb5588baa966edb8cda277df5eba/beacon/engine/types.go#L444-L453

Currently, this won't work without BundleState, which we currently do not track but should. BundleState can only be read from a State DB (so not a cache). Will be a bit tricky to do.

[pamungkaski]

based-op/based/crates/reth/src/exec.rs

Lines 290 to 295 in ab044f6

	let withdrawals_hash = if ub.is_prague {
	let state = self.client.pending()?;
	Some(state.storage_root(ADDRESS_L2_TO_L1_MESSAGE_PASSER, Default::default())?)
	} else {
	None
	};

Attempt to fix: tho still not sure of the use of Default for hashed_storage. Need to address this for pending state

ref: https://github.com/paradigmxyz/reth/blob/main/crates/optimism/consensus/src/validation/isthmus.rs