d3d8: Use a less demanding format for the depth stencil test.

dlls/d3d8/tests/device.c

@@ -513,7 +513,7 @@ static void test_refcount(void)
         }
     }
     /* Surfaces */
-    hr = IDirect3DDevice8_CreateDepthStencilSurface( pDevice, 32, 32, D3DFMT_D24S8, D3DMULTISAMPLE_NONE, &pStencilSurface );
+    hr = IDirect3DDevice8_CreateDepthStencilSurface( pDevice, 32, 32, D3DFMT_D16, D3DMULTISAMPLE_NONE, &pStencilSurface );
     CHECK_CALL( hr, "CreateDepthStencilSurface", pDevice, ++refcount );
     CHECK_REFCOUNT( pStencilSurface, 1);
     hr = IDirect3DDevice8_CreateImageSurface( pDevice, 32, 32, D3DFMT_X8R8G8B8, &pImageSurface );