Fix typo in interwikidata.py
Fix typo in interwikidata.py

fromat-->format
Flake8 should pick it up

Bug: T117396
Change-Id: Ibf808dd2a988a8d2a7da29ddb774d065a25adc39

Darkdadaah/pywikibot-core,magul/pywikibot-core,jayvdb/pywikibot-core,wikimedia/pywikibot-core,hasteur/g13bot_tools_new,wikimedia/pywikibot-core,darthbhyrava/pywikibot-local,smalyshev/pywikibot-core,happy5214/pywikibot-core,npdoty/pywikibot,magul/pywikibot-core,Darkdadaah/pywikibot-core,hasteur/g13bot_tools_new,happy5214/pywikibot-core,h4ck3rm1k3/pywikibot-core,jayvdb/pywikibot-core,hasteur/g13bot_tools_new,npdoty/pywikibot,h4ck3rm1k3/pywikibot-core,PersianWikipedia/pywikibot-core