WindowState: Update mLastSurfaceInsets at creation time.

Otherwise the first call to updateSurfacePosition may think the surface
insets are changing and defer a transaction, but the client may
not necessarily render another frame as the insets were not actually
changing.

Bug: 74084094
Test: Manual. go/wm-smoke.
Change-Id: I917dff05c4ac0b578d3ccc48c95a10cad8d6d0f9