Letterbox: query overlaps with global coordinates

Fixes an issue where querying for overlaps with the letterbox
mistakenly used the surface-relative coordinate space, instead
of the global one.

Change-Id: Ib8f29c7ae9bf2ce79b2b0098d2dcf0dff4380b7d
Fixes: 123052505
Test: atest LetterboxTest
2 files changed