applets/kickoff: fix huge icons in category list
Kickoff's category list can have apps in it, and in fact we ship this way by default, with KHelpCenter below the categories.
A code change in 0868a5ae to add the new
compact list item style altered how icon size is calculated to take into
account the value of isCategory. But this is false for category list
items that happen to be apps. As a result, the apps in the category list
inappropriately use the app style and their icons are too big.
To fix this, we should force the smaller icon size and list item style for apps in the category list, because there's no room to show the subtitles here.
To make the code clearer, isCategory is renamed to
isCategoryListItem to indicate its status as communicating that the
item lives in the category list, not whether or not it actually is a
category.
BUG: 460349 FIXED-IN: 5.26.4
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