bug 1462475: Remove zones from boosting
bug 1462475: Remove zones from boosting

"boost" was 8.0 for zones, which is used in the SearchFilterBackend to
boost zone root results. In the future, the boost function could be
simplified.

mozilla/kuma,SphinxKnight/kuma,jwhitlock/kuma,a2sheppy/kuma,a2sheppy/kuma,Elchi3/kuma,a2sheppy/kuma,escattone/kuma,jwhitlock/kuma,SphinxKnight/kuma,a2sheppy/kuma,SphinxKnight/kuma,mozilla/kuma,a2sheppy/kuma,jwhitlock/kuma,mozilla/kuma,mozilla/kuma,SphinxKnight/kuma,mozilla/kuma,Elchi3/kuma,Elchi3/kuma,Elchi3/kuma,SphinxKnight/kuma,Elchi3/kuma,SphinxKnight/kuma,jwhitlock/kuma,escattone/kuma,escattone/kuma,jwhitlock/kuma