remove trailing ? if there is one
remove trailing ? if there is one

JuergenWeichand/downloadclient,gdi-by/downloadclient,gdi-by/downloadclient,Intevation/downloadclient,JuergenWeichand/downloadclient,gdi-by/downloadclient,JuergenWeichand/downloadclient,JuergenWeichand/downloadclient,Intevation/downloadclient,gdi-by/downloadclient,Intevation/downloadclient,Intevation/downloadclient