[WIN32K] Don't trust the BITMAPINFOHEADER size

This is not entirely correct yet, but less wrong than before
CORE-16621

win32ss/gdi/ntgdi/dibobj.c

@@ -1288,7 +1288,7 @@ NtGdiStretchDIBitsInternal(
                                BitmapFormat(pbmi->bmiHeader.biBitCount,
                                             pbmi->bmiHeader.biCompression),
                                pbmi->bmiHeader.biHeight < 0 ? BMF_TOPDOWN : 0,
-                               pbmi->bmiHeader.biSizeImage,
+                               cjMaxBits,
                                pvBits,
                                0);