Fix parsing bitrate without greek characters

[nullptr-0]

Output should not be truncated when no greek characters.

[coveralls]

coverage: 98.826%. remained the same
when pulling 26e0e14 on nullptr-0:master
into 4342907 on rabitt:master.

[lostanlen]

Thanks. I think this line is untested at the moment 😳

From what i see, testing this branch would require an extra audio file with no Greek suffix in the bitrate?