fix(api): handle score monitors in name-based lookups

Score monitors have type='score' and ip_version=NULL, but the
GetMonitorByNameAndIPVersion query required ip_version to match.
This broke monitor lookups by name for score monitors.

Modified query to match either:
- Regular monitors with specified ip_version
- Score monitors with NULL ip_version

Fixes issue reported by Ben Harris at:
https://community.ntppool.org/t/monitor-recentmedian-no-longer-works/4002

query.sql

@@ -51,7 +51,7 @@ where
 select * from monitors
 where
   tls_name like sqlc.arg('tls_name') AND
-  ip_version = sqlc.arg('ip_version') AND
+  (ip_version = sqlc.arg('ip_version') OR (type = 'score' AND ip_version IS NULL)) AND
   is_current = 1 AND
   status != 'deleted'
   order by id