Geometry buffer renderer: Fix normals not transformed by the world matrix when using normal maps

[Popov72]

See https://forum.babylonjs.com/t/world-normals-dont-account-for-right-handed-coord-system/54625

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[sebavan]

Crazy we never saw it

[Popov72]

Crazy we never saw it

The problem occurred only when bump textures were used, that may be the reason why we didn't spot it earlier.