Compositor: fix crash on exit

src/Compositor.cpp

@@ -341,8 +341,12 @@ void CCompositor::cleanup() {
         g_pXWaylandManager->m_sWLRXWayland = nullptr;
     }
 
+    wl_display_destroy_clients(g_pCompositor->m_sWLDisplay);
+
     wl_display_terminate(m_sWLDisplay);
 
+    m_sWLDisplay = nullptr;
+
     g_pKeybindManager->spawn("sleep 5 && kill -9 " + std::to_string(m_iHyprlandPID)); // this is to prevent that random "freezing"
                                                                                       // the PID should not be reused.
 }