MALWARE_DB_URL pointed at malwaredomainlist.com, a service that has
been defunct for years, and nothing in the codebase ever fetched or
refreshed it - the only "data" behind malware_check() was a static
snapshot bundled in the repo whose newest entries date back to 2009.
That check ran on every scan against 16+ year old data without
anyone noticing, while maltrail_check() (which does self-update from
a live source) was the only domain check actually doing real work.
Removes malware_check(), its now-unused get_netloc() helper, the
stale bundled data file, and the unused MALWARE_DB_URL setting.
maltrail_check() is unaffected and remains the sole domain check.
Co-authored-by: alanhasn
Co-authored-by: Ajin Abraham <[email protected]>
