concierge-backup: use semicolon as path separator

doc/examples/backup.cfg.example

@@ -1,5 +1,5 @@
 # Directories to backup
-BACKUP_DIR_INCL="/etc /var/mail"
+BACKUP_DIR_INCL=/etc;/var/mail
 
 # Local backup destination
 LOCAL_DIR=/var/backups

src/concierge-backup

@@ -112,7 +112,7 @@ for task in tasks:
 
 # Enumerate directories to backup
 backupInclPaths = [backupTemp]
-backupInclPaths += conf.get('Common', 'BACKUP_DIR_INCL', fallback='').strip('"').split(' ')
+backupInclPaths += conf.get('Common', 'BACKUP_DIR_INCL', fallback='').split(';')
 # Initialize local borg repository
 if not os.path.exists(localDest):
   subprocess.call(['borg','init', encryption, localDest])