Set required depth member for buffer image copy

examples/vulkan_example/imgui_impl_glfw_vulkan.cpp

@@ -483,6 +483,7 @@ bool ImGui_ImplGlfwVulkan_CreateFontsTexture(VkCommandBuffer command_buffer)
         region.imageSubresource.layerCount = 1;
         region.imageExtent.width = width;
         region.imageExtent.height = height;
+        region.imageExtent.depth = 1;
         vkCmdCopyBufferToImage(command_buffer, g_UploadBuffer, g_FontImage, VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL, 1, &region);
 
         VkImageMemoryBarrier use_barrier[1] = {};