Previously restart LibO dialog was shown, but did nothing. I haven't
found an easy way to close all frames with 3 modal dialogs opened, so
now restart dialog simply pops up later (after user bonks OK button
on Tools > Options dialog)

Change-Id: I6e61fa1fc41199c2f16cb80da771202c255f3810
Reviewed-on: https://gerrit.libreoffice.org/50566Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>