Unminimize to save divider position after rotation

Holds the divider ratio in the divider state to persist after
configuration change while minimized. After unminimizing past
a configuration change, the previous position will estimate to
the closest snap target.

Test: manual - minimize, rotate, unminimize
Fixes: 34395958
Change-Id: I6ceffb9f5018b8009069f0aa0085f263d8982319