Matching of sec-relevant keywords in JIRA pages misses some terms

E.g. when processing https://issues.apache.org/jira/browse/AMBARI-25329 the token `vuln...` in the very title of the issue is missed.

Test with:
```
python client/cli/main.py CVE-2020-1936 --use-nvd --repository https://github.com/apache/ambari --report html --use-backend optional --version-interval=2.7.3:2.7.4 --filter-extensions=is
```