luci-base: dispatcher.uc: fix N_() fallback implementation

The fallback implementation of `N_()` accessed the wrong variable, a
global `n` instead of the local `args`. Adjust the expression to reference
the correct variable.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

modules/luci-base/ucode/dispatcher.uc

@@ -886,7 +886,7 @@ dispatch = function(_http, path) {
 		striptags,
 		entityencode,
 		_: (...args) => translate(...args) ?? args[0],
-		N_: (...args) => ntranslate(...args) ?? (n[0] == 1 ? n[1] : n[2]),
+		N_: (...args) => ntranslate(...args) ?? (args[0] == 1 ? args[1] : args[2]),
 	});
 
 	try {