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

This reverts commit e76fc0c4a0dc80d564ecd6b99ab5b6913e0cd65d.

Reason for revert: Alec found another path to rebind output texture that
doesn't trip the emulator bug https://b.corp.google.com/issues/154665573
(included in the CL after this)

Bug: b/140158384

Change-Id: I8ae60b99d6baf2da81997889df5198d2960d4a58
8 files changed