Until now the initial renderpass layout wasn't set, resulting
in errors/warnings when using the renderpass. This PR sets the
initial and final renderpass to general so the code knows what
to expect.
In future this needs to be designed better as the layout will
change when used in as a framebuffer attachment, or presenting
on the screen.
Pull Request: https://projects.blender.org/blender/blender/pulls/109000
bc6027ebaf