recipes-graphics/wayland/agl-compositor_git.bb: Do another SRCREV bump

recipes-graphics/wayland/agl-compositor_git.bb: Do another SRCREV bump

As it seems I've broken the screenshoter for single ouputs, this bump is
necessary to get it working again in CI.

Specifically this bump includes the following changes:

- 2ee86feebc8888d client/screenshooter: Compute the width/height for a single output
- 838df78fe94e5bb agl-compositor: Add NULL check after creating surface/view

Bug-AGL: SPEC-4217

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: If5ad858d2e9aed9f8fc074f7240b54334267538c
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/27083
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>