gcs: properly only use hash of pkscript to insert into filter

This commit fixes a mistake during the rebase process meant to include
this commit in its entire:
dfb640c571

gcs/builder/builder.go

@@ -331,7 +331,7 @@ func BuildBasicFilter(block *wire.MsgBlock) (*gcs.Filter, error) {
 		// For each output in a transaction, we'll add each of the
 		// individual data pushes within the script.
 		for _, txOut := range tx.TxOut {
-			b.AddScript(txOut.PkScript)
+			b.AddEntry(txOut.PkScript)
 		}
 	}