kcms: Port away from SwipeListItem to ItemDelegate
Let's port the remaining uses to the upstream simpler alternative ItemDelegate, which provides a consistent styling and fixes some issues such as the background and highlighting.
This affects the rules, efects and virtual desktops KCMs.
Considering a visual bugfix because the background color is broken for almost any colorscheme (besides Breeze Light without tint)
BEFORE SwipeListItem
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AFTER ItemDelegate
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|---|---|---|
| Desktop Effects |  |
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| Virtual Desktops |  |
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| Window Rules |  |
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