Revert "gltf_loader: correct async capture (shared_ptr<BabylonMaterial>"
Revert "gltf_loader: correct async capture (shared_ptr<BabylonMaterial>"

This reverts commit f8e6f0346e846d4eb09c1f96fcabeb65ba0fd7c0.

samdauwe/BabylonCpp,samdauwe/BabylonCpp,samdauwe/BabylonCpp,samdauwe/BabylonCpp