Make `converse-roomslist` a core (i.e. by default whitelisted) plugin

inverse.html

@@ -28,7 +28,7 @@
             notify_all_room_messages: [
                 'discuss@conference.conversejs.org'
             ],
-            whitelisted_plugins: ['converse-inverse'],
+            whitelisted_plugins: ['converse-inverse', 'converse-singleton'],
             auto_reconnect: true,
             bosh_service_url: 'https://conversejs.org/http-bind/', // Please use this connection manager only for testing purposes
             message_archiving: 'always',

src/converse-core.js

@@ -86,6 +86,7 @@
         'converse-otr',
         'converse-ping',
         'converse-register',
+        'converse-roomslist',
         'converse-rosterview',
         'converse-vcard'
     ];

src/converse-inverse.js

@@ -110,7 +110,6 @@
                 show_controlbox_by_default: true,
                 sounds_path: '/node_modules/converse.js/sounds/', // New default
                 sticky_controlbox: true,
-                whitelisted_plugins: ['converse-roomslist', 'converse-singleton'],
             });
 
             _converse.isMessageToHiddenChat = function (message) {