resolve: respect ui.relative-paths also for warning messages
I guess this should have been part of
72a9aacff645 (resolve: respect
ui.relative-paths, 2019-01-29).
Differential Revision: https://phab.mercurial-scm.org/D5937
pager.pager=p0 # $TESTTMP/sysrc:4
ui.editor=e1 # $TESTTMP/userrc:2
pager.pager=p2 # $PAGER
ui.editor=e1 # $TESTTMP/userrc:2