🍒PanelView: fix panel overlapping windows when Qt scaling is enabled

KX11Extras::setExtendedStrut(...) will multiply struct.* by DPR, so
passing raw coordinates to a struct is wrong. Sizes are already divided
by DPR on X11.

BUG: 456453
FIXED-IN: 5.27.8

(cherry picked from commit 81e41406)