windowscodecs: Return WINCODEC_ERR_FRAMEMISSING if there is no global GIF palette.

dlls/windowscodecs/gifformat.c

@@ -1169,7 +1169,7 @@ static HRESULT WINAPI GifDecoder_CopyPalette(IWICBitmapDecoder *iface,
     IWICPalette *pIPalette)
 {
     TRACE("(%p,%p)\n", iface, pIPalette);
-    return WINCODEC_ERR_PALETTEUNAVAILABLE;
+    return WINCODEC_ERR_FRAMEMISSING;
 }
 
 static HRESULT WINAPI GifDecoder_GetMetadataQueryReader(IWICBitmapDecoder *iface,

dlls/windowscodecs/tests/gifformat.c

@@ -95,7 +95,6 @@ static void test_local_gif_palette(void)
 
     /* global palette */
     hr = IWICBitmapDecoder_CopyPalette(decoder, palette);
-todo_wine
     ok(hr == WINCODEC_ERR_FRAMEMISSING,
        "expected WINCODEC_ERR_FRAMEMISSING, got %#x\n", hr);