[kde-plasma] set gtk4 theme to Breeze

Signed-off-by: Dan Johansen <strit@manjaro.org>

overlays/kde-plasma/etc/skel/.config/gtk-4.0/settings.ini

+[Settings]
+gtk-application-prefer-dark-theme=true
+gtk-cursor-theme-name=breeze_cursors
+gtk-cursor-theme-size=24
+gtk-decoration-layout=icon:minimize,maximize,close
+gtk-enable-animations=true
+gtk-font-name=Noto Sans,  10
+gtk-icon-theme-name=breeze
+gtk-primary-button-warps-slider=false
+gtk-theme-name=Breeze