installation: fix inverted logic in new _NO_TRIGGERS flag
installation: fix inverted logic in new _NO_TRIGGERS flag

Philip Withnall wins today's gold star.

Closes: #2162
Approved by: alexlarsson

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