[diffs] fix pluralization of '0 unmodified lines'

[necolas]

Does what it says on the tin

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[amadeus]

Might be worth applying this on the beta instead of stable, since i don't think we'll do a stable release before 1.2 at this point

[SlexAxton]

Might not be worth it, but the More Official™ to do this would be:

const enCardinalRules = new Intl.PluralRules("en-US"); // can cache this once

const pluralKey = enCardinalRules.select(lines);

if (pluralKey === 'one') {
  return `${lines} unmodified line`;
} else if (pluralKey === 'other') {
  return `${lines} unmodified lines`;
} else {
  throw new Error(`Unexpected plural key: ${pluralKey}`);
}