fix: comma starting a wrapped value broke the line

[sevrai]

Background Information

If a comma (or any field delimiter) is starting a wrapped cell, then the cell is not escaped as a wrapped value and the whole line is broken

I have...

• added at least one test to verify the failure condition is fixed.
• verified the tests are passing.

[coveralls]

coverage: 98.058%. remained the same
when pulling 3a8ce35 on sevrai:fix/field-after-wrap
into ffada90 on mrodrig:main.

[mrodrig]

Thanks for reporting this and the pull request @sevrai! I'll get this merged in and published to NPM shortly.