window-list: Use a more specific GTypeName for workspace indicator

Now that the class inherits from GObject, the generic name easily
conflicts with other classes otherwise, for example with the one
from the workspace-indicator extension.

https://gitlab.gnome.org/GNOME/gnome-shell-extensions/merge_requests/70

extensions/window-list/workspaceIndicator.js

@@ -7,8 +7,9 @@ const PopupMenu = imports.ui.popupMenu;
 const Gettext = imports.gettext.domain('gnome-shell-extensions');
 const _ = Gettext.gettext;
 
-var WorkspaceIndicator = GObject.registerClass(
-class WorkspaceIndicator extends PanelMenu.Button {
+var WorkspaceIndicator = GObject.registerClass({
+    GTypeName: 'WindowListWorkspaceIndicator'
+}, class WorkspaceIndicator extends PanelMenu.Button {
     _init() {
         super._init(0.0, _('Workspace Indicator'), true);
         this.setMenu(new PopupMenu.PopupMenu(this, 0.0, St.Side.BOTTOM));