tools: do not disable `quotes` rule in .eslintrc.js

Re-enable `quotes` rule in .eslintrc.js and fix code to abide by the
rule. As a bonus, this makes the code (IMO, anyway) more readable. (It
certainly isn't *less* readable, at least not IMO.)

PR-URL: https://github.com/nodejs/node/pull/21338


Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>