Qt: Allow toggling fullscreen when VM is paused

src/util/imgui_manager.cpp

@@ -892,6 +892,11 @@ bool ImGuiManager::WantsTextInput()
   return s_imgui_wants_keyboard.load(std::memory_order_acquire);
 }
 
+bool ImGuiManager::WantsMouseInput()
+{
+  return s_imgui_wants_mouse.load(std::memory_order_acquire);
+}
+
 void ImGuiManager::AddTextInput(std::string str)
 {
   if (!ImGui::GetCurrentContext())