Fix that sse is added twice during early skip in var-tx
Fix that sse is added twice during early skip in var-tx

The rd_stats->sse is already updated by
"rd_stats->sse += tmp << 4;",
which is measured by pixel_diff_dist(), i.e. in pixel domain and
w/o quantization().

Change-Id: I4dc20a7e80af9dd846aa5de4298cb56e7f0d8f7e

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom