[flac-dev] Fix cuesheet.c to allow metaflac_test.sh to run to completion

[Earl Chew]

When reading the INDEX from the cue sheet, the format MM:SS:FF format is disallowed if the sample frequency is not a multiple of 75 because the index would only be approximate. However, 00:00:00 is _exact_ because it denotes the start of the track, so allow it as a special case. This allows metaflac_test.sh to pass.
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