rtp: enabling rt_restart for density propagation

git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@14319 bac0169d-1eea-4375-b5f6-f89d2ced9994
forgot to add a file

git-svn-id: svn://svn.code.sf.net/p/cp2k/code/trunk@14320 bac0169d-1eea-4375-b5f6-f89d2ced9994