Error alphabetization fixes

A few things going on here:

• Properly enable alphabetize-errors lint rule (thank you @MylesBorins for pointing this out via #15305 (closed)!)
• Fix alphabetization of lib/internal/errors.js, by removing a duplicate error definition (two for one special, I guess!)

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

errors, test