narrow: copy store narrowspec to working copy immediately We no longer need to delay it until the end of the transaction since we now restore a backup if the transaction aborts. Differential Revision: https://phab.mercurial-scm.org/D5506

[workspace]
members = ["hg-core", "hg-direct-ffi", "hg-cpython"]
exclude = ["chg", "hgcli"]