Resolve "Decoder crash in OSBA (FOA) with BR switching due to bit error detection"

• Related issues: #908 (closed)
• Requested reviewers:

Reason why this change is needed

decoder crash with OSBA bitrate switching with the long test vectors

Description of the change

re-open SPAR encoder/decoder when switching between bitrates < and >= 384 kbps in OSBA

Affected operating points

OSBA with bitrate switching not BE (crash without this fix)

Related to #908 (closed)