gl_shader_disk_cache: Pass core system as argument and guard against games without title ids

src/core/core.cpp

@@ -123,7 +123,7 @@ struct System::Impl {
         Service::Init(service_manager, *virtual_filesystem);
         GDBStub::Init();
 
-        renderer = VideoCore::CreateRenderer(emu_window);
+        renderer = VideoCore::CreateRenderer(emu_window, system);
         if (!renderer->Init()) {
             return ResultStatus::ErrorVideoCore;
         }