[PBCKP-259] fix tests.backup.BackupTest.test_backup_detect_missing_permissions for ptrack and PG-11

Author: kulaginm

tests/backup.py

@@ -600,7 +600,7 @@ def test_backup_detect_missing_permissions(self):
         self.set_archiving(backup_dir, 'node', node)
         node.slow_start()
 
-        if self.ptrack and node.major_version > 11:
+        if self.ptrack:
             node.safe_psql(
                 "postgres",
                 "create extension ptrack")