Fix bug that heads up notification appear even when disable_expand is set

Fixes: 78880433
Test: execute app which setting a disable_expand flag to statusbar.
Test: after that, get a headsup notification.
Test: then, headsup appear and it would be presented as status bar height
Test: runtest systemui

Change-Id: I97cc77ad197ca5bc74ab03cc86f02083608549ba