6408: python3 fix

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21431 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Fixed a typo, two " was missing.

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps40@21432 4ae1f11a-8b86-4847-b8af-ab372f36d1fd