use non-scoped interaction handler instead of the scoped
SimpleFileAccessInteraction so that errors will be handled
with correct pop-up dialogs.
Also throw the correct type of DAVException for
USC_CONNECT_FAILED in Content::Open
Change-Id: If2031dfa2796f91fad6866bc9608194c92658b96
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/169519
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>
