ESLint: Disable no-unused-vars in TypeScript files
ESLint: Disable no-unused-vars in TypeScript files

We turn on `@typescript-eslint/no-unused-vars` for TS files, so let's
turn off the default ESLint one so we don't get duplicated warnings.

Another option would be to disable the TS one but I figure that it's
probably beneficial to run the TS specific rule on TS files.

Change-Id: Id18e03dc41ccd8f9b937abcceab9e6c08ed12a1b
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2112553
Auto-Submit: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>
Commit-Queue: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Reviewed-by: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>

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