workspace taskbars: Fix title not updating

This seems to be an old bug that has been made visible with the new workspace taskbars feature.
Sometimes, when closing a window and re-opening a window of the same program, hyprland reuses the window address. Since m_orphanWindowMap was not being cleaned up on window close, the new window would not be updated properly.

src/modules/hyprland/workspaces.cpp

@@ -466,6 +466,7 @@ void Workspaces::onWindowOpened(std::string const &payload) {
 void Workspaces::onWindowClosed(std::string const &addr) {
   spdlog::trace("Window closed: {}", addr);
   updateWindowCount();
+  m_orphanWindowMap.erase(addr);
   for (auto &workspace : m_workspaces) {
     if (workspace->closeWindow(addr)) {
       break;