chore: remove obsolete comment as a drive-by

Author: LuqiPan

packages/client-utils/src/signing-smart-wallet-kit.ts

@@ -57,7 +57,6 @@ type WalletStoreEntryProxy<T, Recursive extends true | false = false> = {
     : never;
 };
 
-// TODO parameterize as part of https://github.com/Agoric/agoric-sdk/issues/5912
 const defaultFee: StdFee = {
   amount: [{ denom: 'ubld', amount: '500000' }], // XXX enough?
   gas: '19700000',