patchbomb: don't close unused progress topic
The "writing" topic has not been used since 1830d0cc4bc1 (patchbomb:
minor refactoring of mbox functionality, preparing for move,
2011-11-23).
Differential Revision: https://phab.mercurial-scm.org/D3803
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.