Fix Lines Mesh with Push Material

[sebavan]

https://forum.babylonjs.com/t/using-pbrmaterial-in-linesystem-console-warning-webgl-00002a080233e900/37341/7

The warning was thrown because on the first rendered frame bindForSubMesh has not been called so the effect would be undefined resulting in not bind the index buffer.

[bjsplat]

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[bjsplat]

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[Popov72]

GG!