Don't save default doze brightness The default doze brightness shouldn't replace the user's chosen manual brightness. Bug: 372465405 Flag: EXEMPT bugfix Test: atest DisplayPowerControllerTest (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:8d1d95cdc648d3f4ba54893983b3d571502d198d) Merged-In: I8f0032ce473c0aad89bb621498ce2daeb3cfcc14 Change-Id: I8f0032ce473c0aad89bb621498ce2daeb3cfcc14