Fix talkback reading out marquee text

Talkback was focusing on inner marquee text view, so it would announce
partially visible strings like "Open in brows". The parent button
already has the relevant string as part of its content description so
just ignore the inner layout for a11y purposes

Fix: 398128081
Test: manual testing
Flag: EXEMPT bugfix
Change-Id: I4dabb52b0047bee1ff9ca1743afe784ddb6c628c