Revert "merge derp"

This reverts commit 62cb0f3d424e6586f65bc659c26ae232400890b2.
Revert "Re-do contextual notification header images"

This reverts commit 22e055c5527e4aff18a7212bd837c20ae049a527.
Revert "SystemUI: Fix notification header disappearing on tablets"

This reverts commit 9bf1a00b3704a8511b7c9003eb77292b511bf005.
Revert "Add evening time to header"

This reverts commit 7fac00bfc6cb20f9ec78c59d13e82aa10fd7f77c.