Fix tsc complaint in runCli.ts

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing issue: fixes tsc task failing in CI #1130
• That issue was marked as status: accepting prs

Overview

https://app.circleci.com/pipelines/github/typescript-eslint/tslint-to-eslint-config/2131/workflows/941c2781-b0f2-4250-b680-4a6187e4a948/jobs/10958

> tsc

src/cli/runCli.ts:44:9 - error TS2783: 'config' is specified more than once, so this usage will be overwritten.

44         config: "./.eslintrc.js",
           ~~~~~~~~~~~~~~~~~~~~~~~~

  src/cli/runCli.ts:45:9
    45         ...command.parse(rawArgv).opts(),
               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    This spread always overwrites this property.