[ATL] CImage: Follow-up to #5702 (5da3ed6)

Fix the return value of CImage::Detach. CORE-19008

sdk/lib/atl/atlimage.h

···
 
     HBITMAP Detach() noexcept
     {
-        m_hOldBitmap = m_hBitmap = NULL;
+        m_hOldBitmap = NULL;
         m_nWidth = m_nHeight = m_nPitch = m_nBPP = 0;
         m_pBits = NULL;