Fix weighted buff calculation when buff doesnt expire
Fix weighted buff calculation when buff doesnt expire

ronaldpereira/WoWAnalyzer,WoWAnalyzer/WoWAnalyzer,fyruna/WoWAnalyzer,anom0ly/WoWAnalyzer,Juko8/WoWAnalyzer,Juko8/WoWAnalyzer,FaideWW/WoWAnalyzer,anom0ly/WoWAnalyzer,Juko8/WoWAnalyzer,WoWAnalyzer/WoWAnalyzer,WoWAnalyzer/WoWAnalyzer,anom0ly/WoWAnalyzer,ronaldpereira/WoWAnalyzer,yajinni/WoWAnalyzer,FaideWW/WoWAnalyzer,fyruna/WoWAnalyzer,yajinni/WoWAnalyzer,sMteX/WoWAnalyzer,yajinni/WoWAnalyzer,ronaldpereira/WoWAnalyzer,sMteX/WoWAnalyzer,FaideWW/WoWAnalyzer,sMteX/WoWAnalyzer,fyruna/WoWAnalyzer,yajinni/WoWAnalyzer,anom0ly/WoWAnalyzer