Remove useless constants

pc_backup/config/borgmatic/common.yaml

@@ -1,7 +1,3 @@
-constants:
-  home: /mnt/source/home/theenglishway
-  home_windows: /mnt/source/C/Users/Julien
-
 repositories:
   - path: ssh://${STORAGE_BOX_USER}@${STORAGE_BOX_USER}.your-storagebox.de:23/./borg-repo
     label: hetzner