/usr/share/kde4/config/khotnewstuff_upload.knsrc is in kde-runtime-data 4:15.12.3-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [KNewStuff3]
ProvidersUrl=http://download.kde.org/ocs/providers.xml
UploadCategories=KDE Wallpaper 800x600
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