refactor(relayer): Use precomputed LP fees for self-fill (#1451)

src/relayer/Relayer.ts

@@ -322,15 +322,11 @@ export class Relayer {
         profitClient.captureUnprofitableFill(deposit, realizedLpFeePct, relayerFeePct, gasCost);
       }
     } else if (selfRelay) {
-      const { realizedLpFeePct } = await hubPoolClient.computeRealizedLpFeePct({
-        ...deposit,
-        paymentChainId: destinationChainId,
-      });
-
       // A relayer can fill its own deposit without an ERC20 transfer. Only bypass profitability requirements if the
       // relayer is both the depositor and the recipient, because a deposit on a cheap SpokePool chain could cause
       // expensive fills on (for example) mainnet.
-      this.fillRelay(deposit, destinationChainId, realizedLpFeePct);
+      const { lpFeePct } = lpFees.find((lpFee) => lpFee.paymentChainId === destinationChainId);
+      this.fillRelay(deposit, destinationChainId, lpFeePct);
     } else {
       // TokenClient.getBalance returns that we don't have enough balance to submit the fast fill.
       // At this point, capture the shortfall so that the inventory manager can rebalance the token inventory.