Homepage in control file is incorrect

[XV-02]

Currently the homepage link in the control file points to a pop-os/cosmic-app-library page that doesn't exist. Correct link is https://github.com/pop-os/cosmic-applibrary

[git-f0x]

Alternatively, the repo could be renamed to cosmic-app-library, since it doesn't quite match the naming scheme of other repos currently.

[wash2]

Ya, I think it could be renamed to cosmic-app-library