unshelve: changes how date is set on interactive mode

On an interactive unshelve, the remaining changes are shelved again
for later. This patch modifies the date of remaining shelved change
to the time of interactive shelve.

Differential Revision: https://phab.mercurial-scm.org/D6685

mercurial/shelve.py

@@ -835,8 +835,7 b' def _createunshelvectx(ui, repo, shelvec'
                                **pycompat.strkwargs(opts))
     snode = repo.commit(text=shelvectx.description(),
                         extra=shelvectx.extra(),
-                        user=shelvectx.user(),
-                        date=shelvectx.date())
+                        user=shelvectx.user())
     m = scmutil.matchfiles(repo, repo[snode].files())
     if snode:
         _shelvecreatedcommit(repo, snode, basename, m)