snapcraft: cannot add personal-files plug

[arky]

I think the personal-files plug configuration is invalid.

$ snap try squashfs-root/
2025-02-27T22:14:21+07:00 INFO snap "dagu" has bad plugs or slots: personal-files (cannot add
personal-files plug: needs valid "read" or "write" attribute)
2025-02-27T22:14:22+07:00 INFO snap "dagu" has bad plugs or slots: personal-files (cannot add
personal-files plug: needs valid "read" or "write" attribute)
dagu 1.16.3-next mounted from /home/arky/Code/Golang/dagu/dist/squashfs-root
WARNING: There is 1 new warning. See 'snap warnings'.