fate: Give some tests more sensible names.

tests/fate/adpcm.mak

tests/fate/demux.mak

tests/fate/dpcm.mak

tests/fate/image.mak

tests/fate/lossless-audio.mak

tests/fate/microsoft.mak

tests/fate/pcm.mak

tests/fate/video.mak

tests/fate/voice.mak

tests/fate/vpx.mak

tests/ref/fate/adpcm-creative

tests/ref/fate/adpcm-creative-8-2.6bit

tests/ref/fate/adpcm-creative-8-2bit

tests/ref/fate/adpcm-creative-8-4bit

tests/ref/fate/adpcm-ea-mad-ea-r1

tests/ref/fate/adpcm-ea-tqi

tests/ref/fate/adpcm-ima-dk3

tests/ref/fate/adpcm-ima-dk4

tests/ref/fate/adpcm-ima_wav-stereo

tests/ref/fate/adpcm-psx-str-v3