[non-BE] Resolve "Noise Bursts in SBA at 32 kbps with FER"
Related to #565 (closed), solving bug in frame erasure for SBA, where the initialisation of total_brate was wrong and 2 other conditions needed correction for inactive content
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Related to #565 (closed), solving bug in frame erasure for SBA, where the initialisation of total_brate was wrong and 2 other conditions needed correction for inactive content