fix: param enabled in section pgprobackup

Author: alexander popov

packaging/conf/example.conf

@@ -191,7 +191,7 @@ interval = 60
 # S(https://github.com/postgrespro/pg_probackup)
 # Trigger fires if some backup has bad status e.g. (ERROR,CORRUPT,ORPHAN).
 [pgprobackup]
-enabled = false
+enabled = False
 interval = 300
 backup_dirs = /backup_dir1,/backup_dir2
 pg_probackup_path = /usr/bin/pg_probackup-11