Allow changing the "_acme-challenge" TXT record ID

[dandv]

@_az

I think your problem is elsewhere if things are taking an hour.

I tried acme.sh and it also failed with "Incorrect TXT record".

Then I simply waited an hour from adding the TXT record to pressing Enter to preform each challenge, and that worked. After two hours, I have my wildcart cert . So I think the problem was with DigitalOcean's caching.