[1/n] Sandbox bounds to appBounds in freeform

In freeform, the container bounds are scaled with appBounds. UI can be
cropped if app draws below the insets and bounds extend beyond
appBounds. Sandbox window bounds to appBounds to keep app content within
the container,

Flag: EXEMPT bug fix
Test: atest SizeCompatTests
Fix: 388011462
Change-Id: I80f87f61094b649804ff3d875d9473bf60e7f1cd