Revert "fdo#67011: Run Display::Yield through KDEXLib::Yield."

This reverts commit 95f60222e75486336b6569afa8f34d60b51c94ad.
(cherry picked from commit 69e7f4491ec78384c46653d3cd8870c97cc9218a)

Change-Id: I180172424092eb64e8a7bc02072e1d477641cc8d
Reviewed-on: https://gerrit.libreoffice.org/8709
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>