Delete saved deferred context state for restore, to avoid leaking refs

* If you replayed an Execute and created the deferred stave state, and
  then didn't replay the Finish (e.g. if an event in between was
  selected) this would leak references and keep buffers alive after
  shutdown.

renderdoc/driver/d3d11/d3d11_context.cpp

@@ -206,6 +206,8 @@ WrappedID3D11DeviceContext::~WrappedID3D11DeviceContext()
   SAFE_RELEASE(m_pRealContext2);
   SAFE_RELEASE(m_pRealContext3);
 
+  SAFE_DELETE(m_DeferredSavedState);
+
   SAFE_DELETE(m_CurrentPipelineState);
   SAFE_RELEASE(m_pRealContext);