Revert "Enable context dropping on stopped only"

This reverts commit 1bcdc4fe.

Reason for revert: Needs additional refinement to avoid regressing
performance for UI in more persistent processes like Launcher. See also b/269425983.

Bug: 269425983
Bug: 245565051
Change-Id: I7397c775162f084cb073de5fc04bd4b95dd5ccd5
(cherry picked from commit abdb4eb6)
Merged-In: I7397c775162f084cb073de5fc04bd4b95dd5ccd5