vp9: SVC: Use prune_evenemore only for non_reference.
Set subpel prune_evenmore only for non_reference frames, instead of all TL > 0 frames. Gain some quality back at cost of small speed loss (~1-2%). Change only effects SVC encoding at speed >= 7. Change-Id: I5b9f51e51dccfd7050521a66996176b0415ca3f9
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