Revert "Add evening time to header"

This reverts commit a7739274e3f8acb7c1e12c59188720c0d6d6ab79.
Revert "Re-do contextual notification header images"

This reverts commit fcf5524386fce718dffa4a9e55b998f5cf36c79d.
Revert "SystemUI: Fix notification header disappearing on tablets"

This reverts commit 914077ee2119d5182fd7ec867fc3787fb90f5746.
Revert "Frameworks: Add time-context headers to the notification header (1/2)"

This reverts commit cf6ddefc8a630b49ac7f29d809835b0439030294.