zsh_completion: rename _hg_style_opts to _hg_template_opts
--style is a deprecated alias for --template, and doesn't show up in help
without --verbose, so completing it doesn't make much sense.
Let's s/style/template/ this variable to be more consistent with cmdutil.py,
which is helpful to look at in parallel next time someone wants to update the
completion rules.
Differential Revision: https://phab.mercurial-scm.org/D4261
#require serve
$ hg clone http://localhost:$HGPORT/ copy
abort: * (glob)
[255]
$ test -d copy
[1]
$ $PYTHON "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
$ cat dumb.pid >> $DAEMON_PIDS
$ hg clone http://localhost:$HGPORT/foo copy2
abort: HTTP Error 404: * (glob)
[255]
$ killdaemons.py