fix(eth-sender): Correct ABI for get_verification_key (#445)

## What ❔

Use correct contract ABI with `get_verification_key` function

## Why ❔

Fix eth-sender for pre-boojum

## Checklist

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- [x] PR title corresponds to the body of PR (we generate changelog
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- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.

core/lib/zksync_core/src/eth_sender/eth_tx_aggregator.rs

@@ -10,7 +10,7 @@ use zksync_types::{
     aggregated_operations::AggregatedOperation,
     contracts::{Multicall3Call, Multicall3Result},
     eth_sender::EthTx,
-    ethabi::Token,
+    ethabi::{Contract, Token},
     protocol_version::{L1VerifierConfig, VerifierParams},
     vk_transform::l1_vk_commitment,
     web3::contract::{tokens::Tokenizable, Error, Options},
@@ -311,6 +311,15 @@ impl EthTxAggregator {
         // New verifier returns the hash of the verification key
         tracing::debug!("Calling get_verification_key");
         if contracts_are_pre_boojum {
+            let abi = Contract {
+                functions: vec![(
+                    self.functions.get_verification_key.name.clone(),
+                    vec![self.functions.get_verification_key.clone()],
+                )]
+                .into_iter()
+                .collect(),
+                ..Default::default()
+            };
             let vk = eth_client
                 .call_contract_function(
                     &self.functions.get_verification_key.name,
@@ -319,7 +328,7 @@ impl EthTxAggregator {
                     Default::default(),
                     None,
                     verifier_address,
-                    self.functions.verifier_contract.clone(),
+                    abi,
                 )
                 .await?;
             Ok(l1_vk_commitment(vk))