Fix divider disappear when rotation on shell transition

When rotation, it will re-init the split divider for new rotation on
DAinfoChanged callback, but when shell transition, we should do it on
startAnimation to make transition smooth and make didider could release
by specfic Transcation to avoid it hide immediately but didn't sync with
transition.

Fix: 222158856
Test: manual
Test: pass existing tests
Change-Id: I797ffd0ea35d89b4ec1e3ef4828ce36e18c860be