Brightness tweaks for low light situations

- Change lowest brightness to 5 from 10.
- Add a new range of 0-5 for pitch dark settings and set it to 5.
- Lower 10-50 range to 25 from 40.

Bug 6457887

Change-Id: Ie5a2ad36dde7f1e199e84ba1d7da13714482cc2e
1 file changed