Update string for Adaptive sleep slice title.

The previous change of the slice title will also impact the title in
Display setting, so this CL creates a new string for the slice title and
revert the change of the normal preference.

Fixes: 151746621
Test: check the titile on Adaptive sleep slice and Display setting.
Change-Id: I2955f4c78b7bf689078deaabcc4148bd5e37b573