LibGUI: Block ComboBox windows from using CommandPalette

Userland/Libraries/LibGUI/ComboBox.cpp

@@ -110,6 +110,7 @@ ComboBox::ComboBox()
     m_list_window = add<Window>(window());
     m_list_window->set_frameless(true);
     m_list_window->set_window_mode(WindowMode::CaptureInput);
+    m_list_window->set_blocks_command_palette(true);
     m_list_window->on_active_input_change = [this](bool is_active_input) {
         if (!is_active_input) {
             m_open_button->set_enabled(false);