MainWindow: Fix memory leaks + improvements #2194
Merged
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Fixes more memory leaks caused by https://gitlab.gnome.org/GNOME/vala/-/issues/1548
(the MainWindow wasn't freed when destroyed).
Also since we now always hold the application we don't have to hide the window to cancel updates since the flatpakbackend is static anyways. This also fixes #2166 and therefore closes #2168