[fix] allowedMethods will fail if two routes are defined

[lbesson-della]

Describe the bug

In commit f7ffb93

if (ctx.matched) {
  ctx.matched.push.apply(ctx.matched, matched.path);
} else {
  ctx.matched = matched.path;
}

has been changed to

if (ctx.matched) {
  ctx.matched.push(matched.path);
} else {
  ctx.matched = matched.path;
}

This causes an issue with allowedMethods if more than a router is defined

Actual behavior

TypeError: Cannot read properties of undefined (reading 'length')
    at D:\code\legisway-connector\node_modules\@koa\router\lib\router.js:330:47

Expected behavior

The code should not fail

Code to reproduce

import Router from '@koa/router';
import Koa from 'koa';

const app = new Koa();
const router1 = new Router();
const router2 = new Router();
router1.get('/foo', ctx => {
  ctx.body = 'foo';
});
router2.get('/bar', ctx => {
  ctx.body = 'bar';
});
app.use(router1.routes());
app.use(router1.allowedMethods({ throw: true }));
app.use(router2.routes());
app.use(router2.allowedMethods({ throw: true }));
app.listen(8888);

$ curl  localhost:8888

Checklist

• I have searched through GitHub issues for similar issues.
• I have completely read through the README and documentation.
• I have tested my code with the latest version of Node.js and this package and confirmed it is still not working.

[3imed-jaberi]

@lbesson-della great catch! Thanks for your reaction here. Always we should pass the context in this kind of code style.