checkimages.py: removed unused untaggedGenerator
checkimages.py: removed unused untaggedGenerator

untaggedGenerator in checkimages uses an obsolete toolserver tool.

Bug: 72496

Change-Id: I634f001c9016239b2e6cc646bbc4272806a79c02

happy5214/pywikibot-core,valhallasw/pywikibot-core,h4ck3rm1k3/pywikibot-core,icyflame/batman,wikimedia/pywikibot-core,darthbhyrava/pywikibot-local,h4ck3rm1k3/pywikibot-core,wikimedia/pywikibot-core,magul/pywikibot-core,Darkdadaah/pywikibot-core,trishnaguha/pywikibot-core,magul/pywikibot-core,smalyshev/pywikibot-core,hasteur/g13bot_tools_new,npdoty/pywikibot,PersianWikipedia/pywikibot-core,emijrp/pywikibot-core,jayvdb/pywikibot-core,happy5214/pywikibot-core,TridevGuha/pywikibot-core,Darkdadaah/pywikibot-core,VcamX/pywikibot-core,hasteur/g13bot_tools_new,xZise/pywikibot-core,npdoty/pywikibot,jayvdb/pywikibot-core,hasteur/g13bot_tools_new