Fix test_preload_langlinks_count
Fix test_preload_langlinks_count

Test currently uses len() on the generator instead of the page list,
causing TypeError: object of type 'PageGenerator' has no len().

Change-Id: I5c1a389926b35e2c86cdf9615338622929cb9077

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