wallpapers/image: allow wallpaper plugin to force enable the apply button
Currently there is no way to enable the apply button if the wallpaper config is not changed, but the image wallpaper plugin needs to force enable the apply button after an image is removed temporarily. This allows to force enable the apply button by adding a boolean to kcm, to let `isSaveNeeded` depend on the boolean, so when the boolean is true, the apply button can be enabled without the need to have any change in wallpaper config. BUG: 438585 FIXED-IN: 5.26 (cherry picked from commit 2f31a338)
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