Revert "lntest: always turn off gossip throttling for nodes created in itests"

This reverts commit 447c9f2c0b.

lntest/node.go

@@ -281,7 +281,6 @@ func (cfg NodeConfig) genArgs() []string {
 	args = append(args, fmt.Sprintf("--invoicemacaroonpath=%v", cfg.InvoiceMacPath))
 	args = append(args, fmt.Sprintf("--trickledelay=%v", trickleDelay))
 	args = append(args, fmt.Sprintf("--profile=%d", cfg.ProfilePort))
-	args = append(args, fmt.Sprintf("--protocol.legacy.no-gossip-throttle"))
 
 	if !cfg.HasSeed {
 		args = append(args, "--noseedbackup")