Privacy: Allow email registration when no IS if the HS supports it
Privacy: Allow email registration when no IS if the HS supports it

#2657

vector-im/vector-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios,vector-im/vector-ios,vector-im/riot-ios,vector-im/riot-ios,vector-im/riot-ios