Convert counter viewer to item model, sync filter with event browser

qrenderdoc/Windows/Dialogs/SettingsDialog.cpp

@@ -997,6 +997,9 @@ void SettingsDialog::on_EventBrowser_TimeUnit_currentIndexChanged(int index)
   if(m_Ctx.HasEventBrowser())
     m_Ctx.GetEventBrowser()->UpdateDurationColumn();
 
+  if(m_Ctx.HasPerformanceCounterViewer())
+    m_Ctx.GetPerformanceCounterViewer()->UpdateDurationColumn();
+
   m_Ctx.Config().Save();
 }