blackbox: set lastui even if ui.log is not called (
issue5518)
`lastui` decides where (where is the `.hg`) to use if the current `ui`
object does not have a `_bbrepo` associated. Previously it only gets set in
`ui.log`, which means unless a `ui` with repo associated calls `log` with
tracked event, blackbox does not know where to write its log. This patch
makes `reposetup` set `lastui` so it so we could log some more events (see
test changes).
Differential Revision: https://phab.mercurial-scm.org/D655
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