Revert "launcher: added a input buffer to caching costly orders"

This commit reverts 2 previous commits :
https://github.com/mandriva-management-console/mmc/commit/9f1a10dfe280c1421909fb3d5a3768a978c3d52f
https://github.com/mandriva-management-console/mmc/commit/49e279a3677a946a021cbc110ab5a19a69833855