itest: remove extra graph topology subscription

lntest/wait/wait.go

@@ -5,17 +5,18 @@ import (
 	"time"
 )
 
+// PollInterval is a constant specifying a 200 ms interval.
+const PollInterval = 200 * time.Millisecond
+
 // Predicate is a helper test function that will wait for a timeout period of
 // time until the passed predicate returns true. This function is helpful as
 // timing doesn't always line up well when running integration tests with
 // several running lnd nodes. This function gives callers a way to assert that
 // some property is upheld within a particular time frame.
 func Predicate(pred func() bool, timeout time.Duration) error {
-	const pollInterval = 200 * time.Millisecond
-
 	exitTimer := time.After(timeout)
 	for {
-		<-time.After(pollInterval)
+		<-time.After(PollInterval)
 
 		select {
 		case <-exitTimer: