multi: fix make lint

Fixes new lint errors caught by the latest version.

lncfg/watchtower.go

@@ -5,7 +5,7 @@ import "github.com/lightningnetwork/lnd/watchtower"
 // Watchtower holds the daemon specific configuration parameters for running a
 // watchtower that shares resources with the daemon.
 //
-// nolint:lll
+//nolint:lll
 type Watchtower struct {
 	Active bool `long:"active" description:"If the watchtower should be active or not"`