Commit 848b1a05 (fix for bnc#659631,
2011-02-04) made wwSectionManager::InsertSegments() use
SwPageDesc::WriteUseOn() directly, instead of going via
SwPageDesc::SetUseOn() that takes care of not throwing away the higher
share bits of the bitfield. This way the "is first shared" flag of the
bitfield got cleared, even when the input document had no title page
declared, so first header/footer must be shared.

Fix the problem by using SetUseOn() in the DOC import as well when it
comes to handling odd/even page section breaks.

Change-Id: If167f4582919fa177840ed81e0a53aa379485598
Reviewed-on: https://gerrit.libreoffice.org/23885Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>