BUG: 390594
Right now the Add-ons are separated into two somewhat arbitrary categories, and most of what's in the "Application addons" category is really more Plasma-related.
This patch puts all the add-ons in a single top-level category, which yields the following benefits:
- No awkward and arbitrary split between top-level categories
- Easier to find what you're looking for by browsing
- Easier to find what you're looking for by searching, since a search now searches all categories
This is a somewhat crude patch, and there may be a better way to do it. But it does work.