Use kFilterBilinear with libyuv when allowed

The condition for determining whether kFilterNone or kFilterBilinear
should be used was changed incorrectly in commit 95d96ea
(Refactor YUV->RGB conversion with libyuv), causing
AVIF_CHROMA_UPSAMPLING_AUTOMATIC to not use kFilterBilinear with libyuv.
Fix the condition by reverting to the original code.

Fix AOMediaCodec#1475.

src/reformat_libyuv.c

@@ -916,7 +916,10 @@ avifResult avifImageYUVToRGBLibYUV(const avifImage * image, avifRGBImage * rgb,
     int libyuvResult = -1;
     int uPlaneIndex = isYVU ? AVIF_CHAN_V : AVIF_CHAN_U;
     int vPlaneIndex = isYVU ? AVIF_CHAN_U : AVIF_CHAN_V;
-    const enum FilterMode filter = nearestNeighborFilterAllowed(rgb->chromaUpsampling) ? kFilterNone : kFilterBilinear;
+    const enum FilterMode filter =
+        ((rgb->chromaUpsampling == AVIF_CHROMA_UPSAMPLING_FASTEST) || (rgb->chromaUpsampling == AVIF_CHROMA_UPSAMPLING_NEAREST))
+            ? kFilterNone
+            : kFilterBilinear;
     if (lcf.yuvToRgbMatrixFilterHighBitDepth != NULL) {
         libyuvResult = lcf.yuvToRgbMatrixFilterHighBitDepth((const uint16_t *)image->yuvPlanes[AVIF_CHAN_Y],
                                                             image->yuvRowBytes[AVIF_CHAN_Y] / 2,