Revert "[RenderEngine] Rebind output texture when unbinding framebuffer"

This reverts commit d9c717511c46eefa78821a7e326bffde4f02076b.

Reason for revert: Short-term, to unblock emulator users due to
blank app drawer/recents: https://b.corp.google.com/issues/154665573

Bug: b/140158384

Change-Id: Ie3c6500b31eada4bf831ecef1a69c079db4cc61f
8 files changed