Use the propagator to trigger the e2e info fetch

Use the propagator to trigger the e2e info fetch

This is a much better place than the GUI, this way we ensure the
propagator is always operating of up to date information. Previously if
the propagator kicked in without user interaction from startup (not
showing the settings dialog) it would have no E2E information available
whatsoever... unsurprisingly it would thus take wrong information at
every turn.

Signed-off-by: Kevin Ottens <kevin.ottens@nextcloud.com>