Fix monthly active user stats query

nodeinfo.go

@@ -98,7 +98,7 @@ WHERE collection_id IS NOT NULL
 		err = r.db.QueryRow(`SELECT COUNT(*) FROM (
 SELECT DISTINCT collection_id
 FROM posts
-INNER JOIN FROM collections c
+INNER JOIN collections c
 ON collection_id = c.id
 WHERE collection_id IS NOT NULL
 	AND updated > DATE_SUB(NOW(), INTERVAL 1 MONTH)) co`).Scan(&activeMonth)