Fix: Enable Vulkan Workarounds

Vulkan workarounds could not be enabled by using the
`--debug-gpu-force-workarounds` command line argument. This PR fixes
this.

Pull Request: https://projects.blender.org/blender/blender/pulls/114579

source/blender/gpu/vulkan/vk_backend.cc

@@ -92,6 +92,7 @@ void VKBackend::detect_workarounds(VKDevice &device)
     workarounds.shader_output_layer = true;
     workarounds.shader_output_viewport_index = true;
 
+    device.workarounds_ = workarounds;
     return;
   }