Use appropriate values as layout for input attachments in vkb::RenderPass.

[asuessenbach]

Description

Input attachments need to have VK_IMAGE_LAYOUT_DEPTH_STENCIL_READ_ONLY_OPTIMAL or VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL as layout.

Build tested on Win10 with VS2022. Run tested on Win10 with NVidia GPU.

Fixes #1197

For yet unknown reasons, I get VVL errors that are not obviously related to this change with the performance samples layout_transitions and subpasses when I run in batch mode, but not when running in sample mode!

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