regtest: put rgb and yuv reference files in correct place

[ffmpeg] / tests / ref / vsynth2 / asv2

9649a4b68fb1107bad13e8a7574cc72d *./tests/data/vsynth2/asv2.avi
789072 ./tests/data/vsynth2/asv2.avi
74a78015b64b2cf8cb9da2e44f508a69 *./tests/data/asv2.vsynth2.out.yuv
stddev:   10.28 PSNR: 27.89 bytes:  7603200/  7603200