android_jni: Fix call to avifImageYUVToRGB

flags variable was added in febec9cc [1].

https://github.com/AOMediaCodec/libavif/commit/febec9ccdfbfa82d90896e90a468bba961d75834
diff --git a/android_jni/avifandroidjni/src/main/jni/libavif_jni.cc b/android_jni/avifandroidjni/src/main/jni/libavif_jni.cc
index c23bfc5..20cd7b0 100644
--- a/android_jni/avifandroidjni/src/main/jni/libavif_jni.cc
+++ b/android_jni/avifandroidjni/src/main/jni/libavif_jni.cc
@@ -162,7 +162,8 @@
   }
   rgb_image.pixels = static_cast<uint8_t*>(bitmap_pixels);
   rgb_image.rowBytes = bitmap_info.stride;
-  res = avifImageYUVToRGB(decoder.decoder->image, &rgb_image);
+  res = avifImageYUVToRGB(decoder.decoder->image, &rgb_image,
+                          AVIF_YUV_TO_RGB_DEFAULT);
   AndroidBitmap_unlockPixels(env, bitmap);
   if (res != AVIF_RESULT_OK) {
     LOGE("Failed to convert YUV Pixels to RGB. Status: %d", res);