tests: update py3 test since json fields are now sorted
The fields have been sorted since 814151cd8c4a (logcmdutil: rewrite
jsonchangeset printer to be backed by jsonformatter, 2018-04-13), and
the test case has thus been failing since that commit.
Differential Revision: https://phab.mercurial-scm.org/D3570
#require docutils gettext
$ $TESTDIR/check-gendoc de
checking for parse errors
Die Dateien werden dem Projektarchiv beim n\xc3\xa4chsten \xc3\x9cbernehmen (commit) hinzugef\xc3\xbcgt. Um dies vorher r\xc3\xbcckg\xc3\xa4ngig zu machen, siehe:hg:`forget`. (esc)
warning: please have a space before :hg: