[bugfix] re-enable -limit option in checkimages.py
[bugfix] re-enable -limit option in checkimages.py

Bug: T228961
Change-Id: Ibe69b4021175f30a6e261b382a559ccaa2d6fcda

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