Add a test case for directivity configuration text file [CI]
Related to #688 (closed) A test case is Non-BE since the directivity configuration file is changed for that particular case:
// 4 ISM with extended metadata at 256 kbps, 48 kHz in, 48 kHz out, BINAURAL out, head rotation, directivity configuration, random FEC at 5%
The link to binary file is removed for the above case from the directivity configuration text file and the text file is added as a secondary configuration file.