tools: add fixer for prefer-assert-iferror.js

PR-URL: https://github.com/nodejs/node/pull/16648
Refs: https://github.com/nodejs/node/issues/16636


Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>