Added tslint-eslint-plugin package as necessary to install commands

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing issue: fixes @typescript-eslint/tslint-eslint-plugin isn't suggested for installation when necessary #406
• That issue was marked as status: accepting prs

Overview

@typescript-eslint/tslint-to-eslint-config isn't explicitly added to the missing list in rule conversion results. It's more of an "implied" missing package. 😄