fix code in UpdateShare() added in r13775 that prevents 2nd identical invite from generating 2nd identical notification


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13883 e27351fd-9f3e-4f54-a53b-843176b1656c
whitespace


git-svn-id: https://svn.calendarserver.org/repository/calendarserver@13884 e27351fd-9f3e-4f54-a53b-843176b1656c