fix(test): remove duplicate word (expressjs#6456)

Signed-off-by: dufucun <dufuchun@sohu.com>

Author: dufucun

test/app.router.js

@@ -1156,7 +1156,7 @@ describe('app.router', function () {
  assert.strictEqual(app.get('/', function () { }), app)
  })
 
- it('should should not use disposed router/middleware', function (done) {
+ it('should not use disposed router/middleware', function (done) {
  // more context: https://github.com/expressjs/express/issues/5743#issuecomment-2277148412
 
  var app = express();

test/res.format.js

@@ -237,7 +237,7 @@ function test(app) {
  })
 
  describe('when no match is made', function(){
- it('should should respond with 406 not acceptable', function(done){
+ it('should respond with 406 not acceptable', function(done){
  request(app)
  .get('/')
  .set('Accept', 'foo/bar')