vp9-svc: Don't allow encode_breakout on golden ref.
For 1 pass cbr SVC: GOLDEN is the spatial reference, better not to check for encoder_breakout on this reference. Small positive ~0.075% (mostly neutral) gain in avgPSNR/SSIM metrics. No observed change in encoder speed. Change-Id: Ib337f16d6771105bf06384c6a23ad047fc690418
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