transaction: drop installation caches when needed
transaction: drop installation caches when needed

If a remote is added or modified in the cloned FlatpakDir
we also drop caches in the one in the installation.

Fixes #1882

Closes: #1883
Approved by: alexlarsson

matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,matthiasclasen/flatpak,flatpak/flatpak,flatpak/flatpak,matthiasclasen/flatpak,matthiasclasen/flatpak