Change ready override to be a default

Instead of readyOverride overriding all ready groups
during check, instead override the default for new
groups. This allows "trampoline" lifecycle stuff (eg.
finish/relaunch on resize) to block readiness after
allready.

Bug: 407980570
Test: existing tests
Flag: EXEMPT bugfix
Change-Id: If2d56b1b53cd97be5cc414e5225584da99e0cd0f