Migrate from Geary to Evolution.

The version on Flathub doesn't work with OAuth authentication for GMail.

.config/autostart/geary.desktop

-[Desktop Entry]
-Name[en_US]=Geary
-Comment[en_US]=flatpak run org.gnome.Geary --hidden
-Exec=flatpak run org.gnome.Geary --hidden
-Icon=org.gnome.Geary
-X-GNOME-Autostart-enabled=true
-Type=Application