Add context flush to MSAA -> Array copy. Refs #1119

* The previous flush was in Array -> MSAA which is not used during capture.

renderdoc/driver/d3d11/d3d11_msaa_array_conv.cpp

@@ -809,6 +809,8 @@ void D3D11DebugManager::CopyTex2DMSToArray(ID3D11Texture2D *destArray, ID3D11Tex
           ctx->Draw(3, 0);
         }
 
+        m_pImmediateContext->Flush();
+
         SAFE_RELEASE(dsvArray);
       }
     }