git-remote-mediawiki: change the behaviour of a split

A "split ' '" is turned into a "split / /", which changes its behaviour: the old method matched a run of whitespaces (/\s*/), while the new one will match a single space, which is what we want here. Indeed, in other contexts, changing split(' ') to split(/ /) could potentially be a regression, however, here, when parsing the output of "rev-list --parents", whose output SHA-1's are each separated by a single space, splitting on a single space is perfectly correct. Signed-off-by: Célestin Matte <celestin.matte@ensimag.fr> Signed-off-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>