Fixes audio crash and issues w/ audio playback (#1633)

This was caused by the main thread audio update not being called all the
time, especially Editor Game mode.

The crash was due to main thread containers not being processed and
emptied of their requests.

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

Code/CryEngine/CrySystem/System.cpp

@@ -352,8 +352,6 @@ CSystem::CSystem(SharedEnvironmentInstance* pSharedEnvironment)
         AZ::Debug::Trace::Instance().Init();
     }
 
-    m_bNeedDoWorkDuringOcclusionChecks = false;
-
     m_eRuntimeState = ESYSTEM_EVENT_LEVEL_UNLOAD;
 
     m_bHasRenderedErrorMessage = false;
@@ -948,16 +946,12 @@ bool CSystem::UpdatePostTickBus(int updateFlags, int /*nPauseMode*/)
     }
 
     //////////////////////////////////////////////////////////////////////
-    //update sound system part 2
-    if (!g_cvars.sys_deferAudioUpdateOptim && !m_bNoUpdate)
+    // Update sound system
+    if (!m_bNoUpdate)
     {
         FRAME_PROFILER("SysUpdate:UpdateAudioSystems", this, PROFILE_SYSTEM);
         UpdateAudioSystems();
     }
-    else
-    {
-        m_bNeedDoWorkDuringOcclusionChecks = true;
-    }
 
     //Now update frame statistics
     CTimeValue cur_time = gEnv->pTimer->GetAsyncTime();
@@ -1004,15 +998,6 @@ bool CSystem::UpdateLoadtime()
     return !IsQuitting();
 }
 
-void CSystem::DoWorkDuringOcclusionChecks()
-{
-    if (g_cvars.sys_deferAudioUpdateOptim && !m_bNoUpdate)
-    {
-        UpdateAudioSystems();
-        m_bNeedDoWorkDuringOcclusionChecks = false;
-    }
-}
-
 void CSystem::UpdateAudioSystems()
 {
     AZ_TRACE_METHOD();