vk_dynamic_rendering aborts with an assert when built for debug

Building vk_dynamic_rendering for debug then running

```
cmake -Bbuild -GNinja -DCMAKE_BUILD_TYPE=Debug
cmake --build build
./build/bin/vk_dynamic_rendering
```

I get this assert:

```
vk_dynamic_rendering: /usr/local/google/home/hitchens/git/bigwheels/third_party/imgui/backends/imgui_impl_vulkan.cpp:1292: bool ImGui_ImplVulkan_Init(ImGui_ImplVulkan_InitInfo *): Assertion `info->PipelineInfoMain.RenderPass == nullptr' failed.
Aborted (core dumped) ./build/bin/vk_dynamic_rendering
```

This happens on both Windows and Linux. I don't know if this is due to the submodule update. It doesn't happen when built for Release