Rename "centralized_status_bar_dimens_refactor" flag

A normal flag can't just be turned into a bug fix flag. It has to be
renamed.

Bug: 317199366
Test: NA
Flag: ACONFIG com.android.systemui.centralized_status_bar_height_fix DISABLED
Change-Id: Id41e2017ca3016bd2a331b5d52b897ca232ae495