6657:  Book report: Sub reports forget/overwrite their settings when trying to re-configure them

(This is already in gramps40 and trunk, see revision 19916)


git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/branches/maintenance/gramps34@22361 4ae1f11a-8b86-4847-b8af-ab372f36d1fd