tests: disable `worker.backgroundclose` to stabilize a test on Windows
TIL that `worker.enabled=0` doesn't prevent these workers from spinning up. At
any rate, there's already a whole lot of conditionalized output following
`cat client.log`, the placement of the "starting 4 threads for background file
closing" message seems unstable, and we don't care about those worker threads
here. Preventing the message is better for test maintenance.
#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: