Revert "use plasma_install_bundled_package"

This reverts commit c505a726.

Quoting David Edmundson from similar commit to plasma-workspace:
"
Concept is fine, but currently we have severe CMake issues as well
as a major containment loading bug.

When re-reverting we need to be sure to test with clean install prefixes.
"
CC: plasma-devel@kde.org