fix contract window check
fix contract window check

mtlynch/Sia,mnsl/Sia,ChrisSchinnerl/Sia,ericflo/Sia,MrStrong/Sia,johnathanhowell/Sia,NebulousLabs/Sia,mnsl/Sia,ericflo/Sia,rivine/rivine,ChrisSchinnerl/Sia,mtlynch/Sia,NebulousLabs/Sia,mharkus/Sia,mharkus/Sia,MrStrong/Sia,rivine/rivine