regtest: put rgb and yuv reference files in correct place

[ffmpeg] / tests / ref / vsynth2 / flashsv

0667077971e0cb63b5f49c580006e90e *./tests/data/vsynth2/flashsv.flv
12368953 ./tests/data/vsynth2/flashsv.flv
592b3321994e26a990deb3a0a1415de9 *./tests/data/flashsv.vsynth2.out.yuv
stddev:    0.65 PSNR: 51.84 bytes:  7603200/  7603200