Fix bug with --install-scripts option

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21263 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Update post-install scripts

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@21265 4ae1f11a-8b86-4847-b8af-ab372f36d1fd