bookmarks: display the obsfate of hidden revision we create a bookmark on
Display the same message we added recently to the filtered error message
create a bookmark on an hidden revision.
Differential Revision: https://phab.mercurial-scm.org/D1870
pager.pager=p0 # $TESTTMP/sysrc:4
ui.editor=e1 # $TESTTMP/userrc:2
pager.pager=p2 # $PAGER
ui.editor=e1 # $TESTTMP/userrc:2