chimera: do not explicitly remove enties in t_level_x

as DB takes care about it.

Acked-by: Gerd Behrmann
Target: master
Require-book: no
Require-notes: no
(cherry picked from commit bdf4048f67750e7092112e2cc9d380a1fe3ca2f5)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
Merge pull request #817 from kofemann/dont-delete-level

chimera: do not explicitly remove enties in t_level_x