textlib.py: pyflakes fix
textlib.py: pyflakes fix

local variable '_line' is assigned to but never used

Change-Id: I03925ef12228c3969442def3af11fc1ba7b641d8

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