backup: drop unused backupStatus search condition from listBackups

The backupStatus condition was carried over from main, where #13254 added a
status filter to listBackups. 4.22 has neither ListBackupsCmd.getBackupStatus()
nor a setParameters call for it, so the condition is never populated and
SearchCriteria.getWhereClause() skips it. Dead code on this branch; the
statusNeq clause that hides tombstoned chain members is the one in use.

Author: abh1sar

server/src/main/java/org/apache/cloudstack/backup/BackupManagerImpl.java

@@ -977,7 +977,6 @@ public Pair<List<Backup>, Integer> listBackups(final ListBackupsCmd cmd) {
         // Tombstoned chain backups (Status.Hidden) are never shown to users; they exist only so the
         // incremental chain GC can sweep them once their last descendant is deleted.
         sb.and("statusNeq", sb.entity().getStatus(), SearchCriteria.Op.NEQ);
-        sb.and("backupStatus", sb.entity().getStatus(), SearchCriteria.Op.EQ);
 
         if (keyword != null) {
             sb.and().op("keywordName", sb.entity().getName(), SearchCriteria.Op.LIKE);