resource_importer_scene.cpp does not copy lods during _rescale_importer_mesh

### Tested versions

- Reproducible in 4.3 dev

### System information

Windows 10

### Issue description

Bug in _rescale_importer_mesh, it should copy lods from surfaces in line 475. I have custom code to put custom LODs in a mesh and they are completely ignored. I will probably patch the issue and make a pull request later.

### Steps to reproduce

Requires custom code with custom LOD to test. But the bug is evident when you look at the code in _rescale_importer_mesh in line 475.

### Minimal reproduction project (MRP)

Requires custom code, but looking at the code should make it evident.

Open resource_importer_scene.cpp and inspect _rescale_importer_mesh around line 475, where the issue reports that surface LODs are not copied. Use custom mesh code with custom LODs to reproduce the behavior. Done means imported meshes preserve their custom LODs during rescaling.

Written by the indexing model from the issue text.