itest: wrap deriveCustomScopeAccounts at 80 chars

This commit fixes that word wrapping for the deriveCustomScopeAccounts
function docs, and ensures that it wraps at 80 characters or less.

itest/lnd_remote_signer_test.go

@@ -517,8 +517,8 @@ func testOutboundRSMacaroonEnforcement(ht *lntest.HarnessTest) {
 	require.NoError(ht, err, "Shouldn't error on watch-only node startup")
 }
 
-// deriveCustomScopeAccounts derives the first 255 default accounts of the custom lnd
-// internal key scope.
+// deriveCustomScopeAccounts derives the first 255 default accounts of the
+// custom lnd internal key scope.
 func deriveCustomScopeAccounts(t *testing.T) []*lnrpc.WatchOnlyAccount {
 	allAccounts := make([]*lnrpc.WatchOnlyAccount, 0, 255+len(accounts))
 	allAccounts = append(allAccounts, accounts...)