remove estimated competitive price from siac
remove estimated competitive price from siac

fix #1707

ChrisSchinnerl/Sia,ericflo/Sia,ChrisSchinnerl/Sia,mharkus/Sia,MrStrong/Sia,NebulousLabs/Sia,MrStrong/Sia,mtlynch/Sia,mharkus/Sia,NebulousLabs/Sia,ericflo/Sia,mtlynch/Sia