[FIX] site_tests: Typo in the end timestamp
[FIX] site_tests: Typo in the end timestamp

One timestamp contained three digits for the hour which is an invalid
format and it does not test the format.

Change-Id: I1f1bfc60ed397e8c30983b8fe166c71805525463
hasteur/g13bot_tools_new,darthbhyrava/pywikibot-local,h4ck3rm1k3/pywikibot-core,TridevGuha/pywikibot-core,jayvdb/pywikibot-core,VcamX/pywikibot-core,Darkdadaah/pywikibot-core,jayvdb/pywikibot-core,icyflame/batman,smalyshev/pywikibot-core,h4ck3rm1k3/pywikibot-core,happy5214/pywikibot-core,magul/pywikibot-core,npdoty/pywikibot,trishnaguha/pywikibot-core,happy5214/pywikibot-core,hasteur/g13bot_tools_new,xZise/pywikibot-core,emijrp/pywikibot-core,PersianWikipedia/pywikibot-core,valhallasw/pywikibot-core,wikimedia/pywikibot-core,wikimedia/pywikibot-core,magul/pywikibot-core,hasteur/g13bot_tools_new,Darkdadaah/pywikibot-core,npdoty/pywikibot