fix(kit): don't warn if middleware is added twice

packages/kit/src/pages.ts

@@ -51,6 +51,7 @@ export function addRouteMiddleware (input: NuxtMiddleware | NuxtMiddleware[], op
     for (const middleware of middlewares) {
       const find = app.middleware.findIndex(item => item.name === middleware.name)
       if (find >= 0) {
+        if (app.middleware[find].path === middleware.path) { continue }
         if (options.override === true) {
           app.middleware[find] = middleware
         } else {