[Bugfix] compare "-user" instead of "-user:"
[Bugfix] compare "-user" instead of "-user:"

generate_user_files with -user option failed and no user-config.py was
created. A valid config.mylang is needed to run script_tests. The 'language'
language from config2.py leads to missing handlers error. This patch solves it.

Bug: T128318
Change-Id: I1669581b7b5e023dfa0a8088e9117fd336ebc234

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