userWidget: Rename the default style class of the user widget

As the status chooser is going away, it doesn't make sense to
keep the "status-chooser" name around.

https://bugzilla.gnome.org/show_bug.cgi?id=704368

js/ui/userWidget.js

@@ -24,7 +24,7 @@ const Avatar = new Lang.Class({
         this._user = user;
         params = Params.parse(params, { reactive: false,
                                         iconSize: AVATAR_ICON_SIZE,
-                                        styleClass: 'status-chooser-user-icon' });
+                                        styleClass: 'framed-user-icon' });
         this._iconSize = params.iconSize;
 
         this.actor = new St.Bin({ style_class: params.styleClass,