Fix two more bugs introduced by unifying vkb::core::[HPP]Buffer

[asuessenbach]

Description

• While combining the two versions of AccelerationStructure::add_triangle_geometry, one argument of one of those versions got lost
• In the gltf_loader, the additional_buffer_usage_flags to be used for the vertex and index buffers got lost

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

Fixes #1146

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