Fix bluetooth's name too long can't show all

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/2f3f9fd3d5c64232b745ac983f33181e/#63d3e64a5b30400594b2b464e7edb4ec

Change-Id: Id84bc20fbe58c41d3958269bb4abc8e305098e72