Make sure unmap chunks for textures are saved in the base record

* Putting chunks in the subresource chunks is a no-no as these are never
  actually referenced and pulled into the frame capture, they're just
  used for locating the right data pointer. Putting an unmap in here
  could lead to texture data going missing on replay if the texture was
  never actually marked as dirty.

renderdoc/driver/d3d11/d3d11_context_wrap.cpp

@@ -7897,6 +7897,8 @@ void WrappedID3D11DeviceContext::Unmap(ID3D11Resource *pResource, UINT Subresour
             m_pDevice->GetResourceManager()->GetResourceRecord(GetIDForResource(pResource));
         RDCASSERT(record);
 
+        D3D11ResourceRecord *baserecord = record;
+
         if(record->NumSubResources > (int)Subresource)
           record = (D3D11ResourceRecord *)record->SubResources[Subresource];
 
@@ -7912,7 +7914,7 @@ void WrappedID3D11DeviceContext::Unmap(ID3D11Resource *pResource, UINT Subresour
 
           Chunk *chunk = scope.Get();
 
-          record->AddChunk(chunk);
+          baserecord->AddChunk(chunk);
           record->SetDataPtr(chunk->GetData());
 
           record->DataInSerialiser = true;