Fix inconsistent capitalization in app ID

[tfuxu]

Flathub's backend cares about capitalization in application ID, so it needs to be the same throughout the codebase. Otherwise, appstreamcli will error out with filters-but-no-output error.

This PR should fix issues with app ID and hopefully make appstreamcli happy.

[diamondburned]

Wouldn't so.libdb.dissent be the right capitalization? Or does Flatpak want a capitalized D?

[tfuxu]

There aren't any mentions about capitalization of the app name part in Flathub docs, so I guess it doesn't matter.

[diamondburned]

I personally prefer the so.libdb.dissent, could you update the PR to contain that?

[tfuxu]

@diamondburned Updated