ContainmentItem: delete wallpaper item immediately to fix crash
When ContainmentItem receives ItemSceneChange, the window might be destroyed soon. However, if deleteLater is used, the window might be destroyed before the wallpaper item, but the wallpaper item still accesses the dangling window in its dtor, which causes a crash.
BUG: 499944 SENTRY: PLASMA-WORKSPACE-1Y5 FIXED-IN: 6.3.3
Edited by Fushan Wen