fix: Increase Polygon lookback (#1150)

The Polygon finalizer instance limits its lookback to head - lookback,
which is currently set to 1 day. If the finalizer is down or ineffective
for > 1 day then this risks ignoring transactions that would otherwise
be able to be finalised. There's very limited benefit to limiting the
lookback to only 1 day, so pad it out to 5.

src/finalizer/index.ts

@@ -79,8 +79,8 @@ export async function finalize(
   spokePoolClients: SpokePoolClientsByChain,
   configuredChainIds: number[],
   submitFinalizationTransactions: boolean,
-  optimisticRollupFinalizationWindow: number = 5 * oneDaySeconds,
-  polygonFinalizationWindow: number = oneDaySeconds
+  optimisticRollupFinalizationWindow = 5 * oneDaySeconds,
+  polygonFinalizationWindow = 5 * oneDaySeconds
 ): Promise<void> {
   const finalizationWindows: { [chainId: number]: number } = {
     // Mainnets