Fix FTBFS in many TDE sample projects
Place TDE sample projects in a TDE category instead of a KDE category
(part of the original commit)
(cherry picked from commit 93907d7e7a)
This enables compilation under both Qt3 and Qt4
git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdevelop@1236710 283d02a7-25f6-0310-bc7c-ecb5cbfe19da