Bugfix. `initAvatars` wasn't being called.

src/converse-muc.js

@@ -1130,13 +1130,11 @@
             _converse.initAvatars = function () {
                 if (_.isUndefined(_converse.avatars)) {
                     _converse.avatars = new _converse.Avatars();
-                    _converse.avatars.browserStorage = new Backbone.BrowserStorage.local(
-                        b64_sha1(`converse.avatars-${_converse.bare_jid}`)
-                    );
+                    _converse.avatars.browserStorage = new Backbone.BrowserStorage.local(b64_sha1(`converse.avatars`));
                     _converse.avatars.fetch();
                 }
             }
-            _converse.api.listen.on('connectionInitialized', () => _converse.initAvatars);
+            _converse.api.listen.on('connectionInitialized', _converse.initAvatars);
 
             _converse.on('addClientFeatures', () => {
                 if (_converse.allow_muc) {