Don't set a background color for normal unhovered list items
requested to merge ngraham/qqc2-desktop-style:remove-unnecessary-itemdelegate-background into master
Currently the background styling we apply to ItemDelegate and others uses the Kirigami theme's standard view background color for the backgrounds of unhovered list items not using the alternate background color. But this is unnecessary; when the list item is in a view that itself uses the view background color, then the list item's own background color simply matches that of the view it lives in. And when the view intentionally does not use that background color, the result is visual brokenness.
We can fix this by simply not setting a background color for the normal unhovered state of the background.
| Before, Elisa's party mode | After, Elisa's party mode |
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