Fixing initialization of LyShin and removing a macro and ISystemEventListner that were not doing anything

Code/CryEngine/CrySystem/SystemInit.cpp

@@ -1393,11 +1393,6 @@ bool CSystem::InitShine([[maybe_unused]] const SSystemInitParams& initParams)
 
     EBUS_EVENT(UiSystemBus, InitializeSystem);
 
-    if (!m_env.pLyShine)
-    {
-        AZ_Error(AZ_TRACE_SYSTEM_WINDOW, false, "LYShine System did not initialize correctly. Please check that the LyShine gem is enabled for this project in ProjectConfigurator.");
-        return false;
-    }
     return true;
 }