WindowServer: Reevaluate hover state after dismissing window switcher

This makes the cursor update properly if it was above the window
switcher while it was visible, and something underneath it wants to use
something other than the default arrow cursor.

Userland/Services/WindowServer/Window.cpp

@@ -616,6 +616,8 @@ void Window::set_visible(bool b)
         return;
     m_visible = b;
 
+    WindowManager::the().reevaluate_hover_state_for_window(this);
+
     if (!m_visible)
         WindowManager::the().check_hide_geometry_overlay(*this);
     Compositor::the().invalidate_occlusions();