blacklisted_websites: adjust customer/tech-service to reduce FP
blacklisted_websites: adjust customer/tech-service to reduce FP

* Prevent customer/tech-services pattern matching in code
* Add 404techsupport.com to the list of those excluded

While this isn't a perfect, it does eliminate the FP within the last
year and not miss any TP. It's not clear that the added excluded
domain will have an ongoing presence, but it did have two reports
separated by a year, or so. The other domains which were caught
had a record of being TP.

Overall, this change goes
from: 88 Total / 81 TP (92.05% TP) / 7 FP / 0 NAA
to: 83 Total / 81 TP (97.59% TP) / 2 FP / 0 NAA

-autopull

Charcoal-SE/SmokeDetector,Charcoal-SE/SmokeDetector