Use stock button for OK and identation fixes.
Followup changes to:
40209456

Change-Id: I3fe2f2f9a4528d38086db453d7ea71f7ac8b7a9a
Reviewed-on: https://gerrit.libreoffice.org/42800Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Zolnai <tamas.zolnai@collabora.com>