chore: remove read-only flag from backrest mounts

backrest/compose.yaml

@@ -9,8 +9,8 @@ services:
       - /srv/data/backrest/rclone:/root/.config/rclone
       - /srv/data/backrest/repos:/repos
       - /srv/fast/backrest/cache:/cache
-      - /mnt/toshiba:/mnt/toshiba:ro
-      - /srv:/mnt/srv:ro
+      - /mnt/toshiba:/mnt/toshiba
+      - /srv:/mnt/srv
     environment:
       BACKREST_DATA: /data
       BACKREST_CONFIG: /config/config.json