Revert "Support two pane design in the Settings app."

This reverts commit a12a0d1eb234e4841a6633d4614e91a28f5c1517.

Reason for revert:  See a build error in git_sc-v2-dev-plus-aosp/aosp_crosshatch-userdebug

Bug: 198722766
Change-Id: Ibf812bf92595f57409e3c6d9cda6a1dfa4a8c72c
4 files changed