Fix the CI
The current CI is broken due to two bugs:
- in Ubuntu build test, xdg-desktop-portal version being installed is 1.16.0, when at least version 1.17.0 is required to build this repo (also, Ubuntu Mantic ships version 1.18.0).
- the file src/appchooserdialog.c lacks an
#include <adwaita.h>
This MR fixes both bugs, thus fixing the CI.
Edited by Sergio Costas