Update Tasks and Calculator permissions.

[edfloreshz]

This PR adds write permission to dev.edfloreshz.Tasks and dev.edfloreshz.Calculator to be able to write app configuration files.

[bbhtt]

why do app's config files go in xdg-config/cosmic? Shouldn't they be in app's own folder?

[edfloreshz]

The app config files are managed by cosmic-config, it saves them to xdg-config/cosmic/com.example.App/v1/setting-file.

[edfloreshz]

We initially granted read-only permissions to the xdg-config/cosmic directory to enable reading theme changes. However, we subsequently discovered that once any level of host access is provided, crates like xdg or dirs prioritize the host.

This makes it challenging to write app configuration to the sandbox while simultaneously reading theme changes from the host, unless there's an alternative approach we've overlooked

[hfiguiere]

the alternative would be for Cosmic to implemnent this through DBus. I know it's work but it comes with the territory of reinventing the wheel.

[edfloreshz]

I believe that will happen at some point, but in the meantime we still have to rely on this.