Clean up comments in getChallengePeriodSeconds.

packages/sdk/src/cross-chain-messenger.ts

@@ -1003,12 +1003,12 @@ export class CrossChainMessenger {
    * @returns Current challenge period in seconds.
    */
   public async getChallengePeriodSeconds(): Promise<number> {
-    // TODO: remove this if once bedrock launches on mainnet.
+    // TODO: remove this once bedrock launches on mainnet.
     if (!this.bedrock) {
       return (await this.contracts.l1.StateCommitmentChain.FRAUD_PROOF_WINDOW()).toNumber()
     }
     const oracle_version = await this.contracts.l1.L2OutputOracle.version()
-    const challengePeriod = oracle_version === '1.0.0' // oracle_version.toString() === '1.0.0'
+    const challengePeriod = oracle_version === '1.0.0'
       ? BigNumber.from(await this.contracts.l1.OptimismPortal.provider.call({
         to: this.contracts.l1.OptimismPortal.address,
         data: '0xf4daa291' // FINALIZATION_PERIOD_SECOND