[effects/thumbnailaside] Specify screen projection matrix

Summary:
The Lanczos filter is applied to thumbnails, so we need to specify screen
projection matrix in order to properly project window coordinates into
screen-space.

BUG: 407485

Reviewers: KWin, davidedmundson

Reviewed By: KWin, davidedmundson

Subscribers: kwin

Tags: KWin

Differential Revision: https://phabricator.kde.org/D21224