fix: manifest test + remove duplicate test

test/controllers.js

@@ -359,8 +359,8 @@ describe('Controllers', function () {
 		});
 	});
 
-	it('should load /manifest.json', function (done) {
-		request(nconf.get('url') + '/manifest.json', function (err, res, body) {
+	it('should load /manifest.webmanifest', function (done) {
+		request(nconf.get('url') + '/manifest.webmanifest', function (err, res, body) {
 			assert.ifError(err);
 			assert.equal(res.statusCode, 200);
 			assert(body);
@@ -633,15 +633,6 @@ describe('Controllers', function () {
 		});
 	});
 
-	it('should load manifest.json', function (done) {
-		request(nconf.get('url') + '/manifest.json', function (err, res, body) {
-			assert.ifError(err);
-			assert.equal(res.statusCode, 200);
-			assert(body);
-			done();
-		});
-	});
-
 	it('should load theme screenshot', function (done) {
 		request(nconf.get('url') + '/css/previews/nodebb-theme-persona', function (err, res, body) {
 			assert.ifError(err);