[sb] s/Collapsed/Home/ on the view binder and model

Following up from the previous commit, this just renames the view binder
and view model for HomeStatusBar to better match their intent.
"Collapsed" doesn't mean anything anymore, since the notification window
is not the same window as the status bar.

Test: build
Test: atest SystemUITests
Flag: EXEMPT renaming via IDE
Bug: 364360986
Change-Id: Ib8251e7b183df97c77162c96a969b733d4d6ea2c