recipes-graphics/wayland/weston-ini-conf: Add missing transmitter-output

recipes-graphics/wayland/weston-ini-conf: Add missing transmitter-output

Seems that re-shuffling of recipes missed out the transmitter-output
file when using waltham-remoting (in AGL_FEATURES).

Bug-AGL: SPEC-4047

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: I589960eb13532cfaab66a6d32ca79a8628398563
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/26553
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Kenji Hosokawa <khosokawa@jp.adit-jv.com>
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>