Oops, don't crash if animation image fails

Whoops, `Promise.race` isn't quite what I wanted here. This meant that, if the image promise _fails_ before the movie _succeeds_, the outfit would crash even though it doesn't need to. (And this was happening too often, due to a bug in /api/assetImage!)

Now, we accept whichever _successful_ result loads first, or reject if they _both_ fail.

I tested this by having /api/assetImage always throw, and confirmed that it crashed the outfit before this change, and no longer does after this change!

src/app/components/OutfitPreview.js

@@ -417,7 +417,7 @@ export function usePreloadLayers(layers) {
           // The minimal asset for the movie case is *either* the image *or*
           // the movie, because we can start rendering when either is ready.
           minimalAssetPromises.push(
-            Promise.race([imageAssetPromise, movieAssetPromise])
+            Promise.any([imageAssetPromise, movieAssetPromise])
           );
         } else {
           minimalAssetPromises.push(imageAssetPromise);