fix: allow to specify pretty errors in TTY

[elevatebart]

closes #1418

[cspotcode]

Looks good, did you test this? I don't think it needs automated tests but it would be nice to do some manual testing:

ts-node --pretty ./file-with-errors.ts > out.txt // <-- not a TTY but should still have pretty errors
ts-node ./file-with-errors.ts // <-- in a directory where pretty: false is specified in tsconfig.json

EDIT you already asked about testing here

[cspotcode]

Looks like this needs npm run lint-fix to fix linter failures.

[codecov]

Codecov Report

Merging #1420 (e9c31b0) into main (dc0fed2) will increase coverage by 0.01%.
The diff coverage is 66.66%.

Impacted Files	Coverage Δ
src/index.ts	77.80% <66.66%> (+0.05%)	⬆️