launcher:: sort category ids.

to avoid to get the random category id from desktop, sort category ids.

tower:https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/b3ae827538844b888a49d9dc1e694d6f/
Change-Id: If54bca303d40be387b3805b78ef0fe3f3a8cfc5e