tests: fix up some lax escaping in test-template-basic.t
These misfired escapes turn into hard errors in Python 3.7, and I'd
really rather we not work around it. We should *probably* try and find
a way to proactively warn users about invalid escape sequences.
There's one more failure of this type in this file on Python 3.7, but
I can't figure out the issue. It'll need to be corrected in a
follow-up.
Differential Revision: https://phab.mercurial-scm.org/D3843
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.