vpx_temporal_scalable_patterns: set rc_target_bitrate correct.
vpx_temporal_scalable_patterns: set rc_target_bitrate correct.

Current setting was specific to 1 layer case.
rc_target_bitrate is total bitrate for whole stream,
so set it to ts_target_bitrate for highest/top temporal layer.

Change-Id: I83de73364956fa21c0a7c971c9f390d4840457e6

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