Fix ChooserTarget app scoring

An initial sorting step before applying modifiers to the ChooserTarget
scores provided by apps was backwards, causing subsequent target
scores to be heavily penalized. Targets are then heavily influenced by
the lowest score in the set relative to the targets from other apps.

Bug 25013559

Change-Id: I39d5d7c601712fc6a19e694d5846d2c8d17a214f