Don't disable segment with delta_q=0 for aq_mode=1
Don't disable segment with delta_q=0 for aq_mode=1

Because spatial_segmewntation uses segfeature_active() for all the
segments regardless of its delta_q value.

BUG=aomedia:1196

Change-Id: Ibcb7b6e42f703fa02d7cb95143c56f8078a9d475

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