Updated head.js, fixing an issue in IE9
Updated head.js, fixing an issue in IE9

WoltLab/WCF,SoftCreatR/WCF,PhrozenByte/WCF2,WoltLab/WCF,ramiusGitHub/WCF,Cyperghost/WCF,Morik/WCF,Cyperghost/WCF,0xLeon/WCF,SoftCreatR/WCF,MeinAccount/WCF,PhrozenByte/WCF2,joshuaruesweg/WCF,MenesesEvandro/WCF,Cyperghost/WCF,MeinAccount/WCF,WoltLab/WCF,Cyperghost/WCF,WoltLab/WCF,Morik/WCF,NBZ4live/WCF,Cyperghost/WCF,cashcat/WCF-1,0xLeon/WCF,joshuaruesweg/WCF,Morik/WCF,joshuaruesweg/WCF,NBZ4live/WCF,cashcat/WCF-1,ramiusGitHub/WCF,0xLeon/WCF,MenesesEvandro/WCF,Morik/WCF,SoftCreatR/WCF,SoftCreatR/WCF