Fix the header can't be scrolling problem in landscape mode

- Settings header is restricted scrolling by this ag/15029686
- To void some pages can't show the contain part while heading unscrolling.
  We allow the header can be scrolling in the landscape mode.

Fixes: 207353353
Test: make RunSettingsRoboTests -j
Change-Id: I7de4e7cb8d86516ec039f5fe7d033097dca1c9d8