[bugfix] use provided edit summary
[bugfix] use provided edit summary

This solves regression of 7ab93f76e71a83312b9ea61

Bug: T251669
Change-Id: I24b99fa793663638cc91eaf1f837db41ce93e790

wikimedia/pywikibot-core,PersianWikipedia/pywikibot-core,wikimedia/pywikibot-core