Purge the root security page if there has been any changes

We already purged the version specific ones, but the root page got left
unpurged which is incorrect when the actual versions of a cve changes.
To keep it simple, unconditionally purge it when there are any updated
CVEs at all.

Author: mhagander

pgweb/security/loader.py

@@ -61,6 +61,8 @@ def load_security_json():
   SELECT '/support/security/CVE-' || cve || '/' FROM versionload
   UNION
   SELECT '/support/security/' || tree::text || '/' FROM versionload
+  UNION
+  SELECT '/support/security/' WHERE EXISTS (SELECT 1 FROM cveload) OR EXISTS (SELECT 1 FROM versionload)
 ),
 summary AS (
   SELECT cve, action || ' CVE' AS what FROM cveload